TheInfoList

19 (nineteen) is the
natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and total order, ordering (as in "this is the ''third'' largest city in the country"). In common mathematical terminology, w ...
following 18 and preceding 20. It is a
prime number A prime number (or a prime) is a natural number greater than 1 that is not a Product (mathematics), product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime ...
.

# Mathematics

19 is the 8th
prime number A prime number (or a prime) is a natural number greater than 1 that is not a Product (mathematics), product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime ...
, the seventh
Mersenne prime A Mersenne prime is a prime number A prime number (or a prime) is a natural number greater than 1 that is not a Product (mathematics), product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a compo ...
exponent, and the second base-10
repunit In recreational mathematics, a repunit is a number like 11, 111, or 1111 that contains only the digit 1 — a more specific type of repdigit. The term stands for repeated unit and was coined in 1966 by Albert H. Beiler in his book ''Recreatio ...
prime exponent. 19 is the maximum number of fourth powers needed to sum up to any natural number, and in the context of
Waring's problem In number theory Number theory (or arithmetic or higher arithmetic in older usage) is a branch of pure mathematics devoted primarily to the study of the integers and arithmetic function, integer-valued functions. German mathematician Carl Friedri ...
, 19 is the fourth value of g(k). In addition, 19 is a
Heegner numberIn number theory, a Heegner number (as termed by Conway and Guy) is a square-free positive integer d such that the imaginary quadratic field \mathbbsqrt/math> has class number 1. Equivalently, its ring of integersIn mathematics Mathematics ...
and a
centered hexagonal number A centered hexagonal number, or hex number, is a centered figurate number that represents a hexagon In geometry Geometry (from the grc, γεωμετρία; ''wikt:γῆ, geo-'' "earth", ''wikt:μέτρον, -metron'' "measurement") ...
. 19 is also a
centered triangular number A centered (or centred) triangular number is a centered figurate numberThe term figurate number is used by different writers for members of different sets of numbers, generalizing from triangular numbers to different shapes (polygonal numbers) ...
, being the smallest such number that is also prime. Moreover, there exists only one nontrivial normal magic hexagon: the one composed of 19 cells.

# Science

* 19 is the
atomic number 300px, The Rutherford–Bohr model of the hydrogen atom () or a hydrogen-like ion (). In this model it is an essential feature that the photon energy (or frequency) of the electromagnetic radiation emitted (shown) when an electron jumps from one ...
of
potassium Potassium is a chemical element upright=1.0, 500px, The chemical elements ordered by link=Periodic table In chemistry Chemistry is the science, scientific study of the properties and behavior of matter. It is a natural science ...

. * 19 years is very close to 235 lunations. See
Metonic cycle For example, by the 19-year Metonic cycle, the full moon repeats on or near Christmas day between 1711 and 2300. A small horizontal libration is visible comparing their appearances. A red color shows full moons that are also lunar eclipses. The ...

. *
COVID-19 Coronavirus disease 2019 (COVID-19) is a contagious disease A contagious disease is a disease A disease is a particular abnormal condition that negatively affects the structure A structure is an arrangement and organization o ...

is the shortened name of
Coronavirus disease 2019 Coronavirus disease 2019 (COVID-19) is a contagious disease A contagious disease is a disease A disease is a particular abnormal condition that negatively affects the structure A structure is an arrangement and organization o ...
, the cause of the global pandemic that began in 2019.

# Religion

## Islam

* The number of
angel An angel is a supernatural The supernatural encompasses supposed phenomena or entities that are not subject to the . This term is attributed to , such as s, s, , and . It also includes claimed abilities embodied in or provided by such ...

s guarding
Hell In religion Religion is a - of designated and practices, , s, s, , , , , or , that relates humanity to , , and elements; however, there is no scholarly consensus over what precisely constitutes a religion. Different religions may o ...

("Hellfire") ("Saqar") according to the
Qur'an The Quran (, ; ar, القرآن , "the recitation"), also romanized Qur'an or Koran, is the central religious text of Islam, believed by Muslims to be a revelation in Islam, revelation from God in Islam, God (''Allah''). It is widely rega ...

: ''"Over it are nineteen"'' ( 74:30), after which the Qur'an describes this number as being ''"a trial for those who disbelieve"'' (74:31), a sign for people of the scripture to be ''"convinced"'' (74:31) and that believers ''"will increase in faith"'' (74:31) due to it... * The Number of Verse and Sura together in the Qur'an which announces Jesus son of Maryam's (Mary's) birth (Qur'an 19:19). * A group called United Submitter International claim the Quran has mathematical structure based on the number 19. The gematrical value of WAHD = 6+1+8+4=19, Wahd means 'One' (God) to the first verse (1:1), known as Bas-malah, consists of 19 Arabic letters or the Quran consists of 114 (19x6) su-ras etc.

## Baháʼí faith

In the Bábí and
Baháʼí Faith The Baháʼí Faith (; fa , بهائی ') is a new religion teaching the essential worth of all religions and the unity of all people. Established by Baháʼu'lláh Baháʼu'lláh (12 November 1817 – 29 May 1892) was a Persian ...
s, a group of 19 is called a ''Váhid'', a Unity (
Arabic Arabic (, ' or , ' or ) is a Semitic language The Semitic languages are a branch of the Afroasiatic language family originating in the Middle East The Middle East is a list of transcontinental countries, transcontinental region ...

: واحد ''wāhid'', "one"). The numerical value of this word in the Abjad numeral system is 19. * The
Baháʼí calendar The Badíʻ calendar used in the Baháʼí Faith The Baháʼí Faith (; fa , بهائی ') is a new religion teaching the essential worth of all religions and the unity of all people. Established by Baháʼu'lláh Baháʼu'lláh (1 ...
is structured such that a year contains 19 months of 19 days each (along with the intercalary period of
Ayyám-i-Há Ayyám-i-Há refers to a period of intercalary day Intercalation or embolism in timekeeping is the insertion of a leap day, week, or month into some calendar years to make the calendar follow the seasons or moon phases. Lunisolar calendars may r ...
), as well as a 19-year cycle and a 361-year (19x19) supercycle. *The
Báb The Báb, born Sayyed `Alí Muḥammad Shírází (; fa, سيد علی ‌محمد شیرازی; October 20, 1819 – July 9, 1850) was the founder of Bábism The Bábi Faith ( fa, بابیه, ''Babiyye'') is an Abrahamic religions, Abrah ...
and his disciples formed a group of 19. *There were 19 Apostles of Bahá'u'lláh.

# Music

*" 19" is a 1985 song by Paul Hardcastle, including
sampled Sample or samples may refer to: Base meaning * Sample (statistics) In statistics Statistics is the discipline that concerns the collection, organization, analysis, interpretation, and presentation of data. In applying statistics to a sci ...
soundbites taken from a documentary about the
Vietnam War {{Infobox military conflict , conflict = Vietnam War , partof = the Indochina Wars The Indochina Wars ( vi, Chiến tranh Đông Dương) were a series of wars fought in Southeast Asia Southeast Asia, also spelled ...
in which 19 is claimed to have been the average age of United States soldiers killed in the conflict. The song was parodied by British satirist
Rory Bremner Roderick Keith Ogilvy "Rory" Bremner,"Rory Bremner". ''Who Do You Think You Are? (British TV series), Who Do You Think You Are?''. Wall to Wall (production company), Wall to Wall for BBC One. 2 February 2009. No. 1, series 6. (born 6 April 1961 ...
under the pseudonym 'The Commentators,' as ''N-n-nineteen, Not Out'', the title referring to the batting average of David Gower, the
England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest of England and the Celtic Sea to the southwest. E ...
cricket Cricket is a Bat-and-ball games, bat-and-ball game played between two teams of eleven players each on a cricket field, field at the centre of which is a cricket pitch, pitch with a wicket at each end, each comprising two Bail (cricket), bai ...

captain, during his side's risible performance against the
West Indies The West Indies are a subregion A subregion is a part of a larger region In geography Geography (from Greek: , ''geographia'', literally "earth description") is a field of science devoted to the study of the lands, features, in ...
in 1984 when they lost 5–0. *"
I Was Only Nineteen "Only 19", "I Was Only 19" or "A Walk in the Light Green" is the most widely recognised song by Australian folk music, folk group Redgum. The song was released in March 1983 as a single, which hit number one on the national Kent Music Report Singl ...
" by the Australian group Redgum reached number one on the Australian charts in 1983. In 2005 a hip hop version of the song was produced by The Herd. *'' 19'' is the name of Adele's 2008 debut album, so named since she was 19 years old at the time. *"
Hey Nineteen "Hey Nineteen" is a song by the band Steely Dan Steely Dan is an American Rock music, rock band founded in 1971 by core members Walter Becker (guitars, bass, backing vocals) and Donald Fagen (keyboards, lead vocals). Blending elements of rock, ja ...
" is a song by American jazz rock band Steely Dan, on the 1980 album ''Gaucho''. *Nineteen has been used as an alternative to twelve for a division of the octave into equal parts. This idea goes back to
Salinas Salinas may refer to: People *Salinas (surname) Places Americas Latin America * Salinas (ancient lake), in the Salar de Uyuni, Bolivia * Salinas, Minas Gerais, a municipality in the state of Minas Gerais, Brazil * Playa Grande, Costa Rica ...

in the sixteenth century, and is interesting in part because it gives a system of
meantone Meantone temperament is a musical temperament, that is a tuning system, obtained by slightly compromising the fifths in order to improve the thirds. Meantone temperaments are constructed the same way as Pythagorean tuning, as a stack of equal fift ...

tuning, being close to 1/3 comma meantone. ''See
19 equal temperament In music, 19 equal temperament, called 19 TET, 19 EDO ("Equal Division of the Octave"), or 19 Equal temperament, ET, is the musical temperament, tempered scale derived by dividing the octave into 19 equal steps (equal frequ ...
.'' *Some organs use the 19th harmonic to approximate a minor third.

# Literature

*
Stephen King Stephen Edwin King (born September 21, 1947) is an American author of , , , , , and novels. Described as the "King of Horror", a play on his surname and a reference to his high standing in pop culture, his books have sold more than 350  ...
's eight-book epic ''The Dark Tower'' saga employs the number 19 in books '' The Dark Tower: The Gunslinger'', '' The Dark Tower V: Wolves of the Calla'', '' The Dark Tower VI: Song of Susannah'', '' The Dark Tower VII: The Dark Tower'', and ''
The Wind Through the Keyhole ''The Dark Tower: The Wind Through the Keyhole'' is a fantasy Fantasy is a genre of speculative fiction set in a fictional universe, often inspired by real world myth and folklore. Its roots are in oral traditions, which then became fantasy li ...
'' as a mysterious and important number. They refer to the "ka-tet of 19", "Directive Nineteen," many names add up to 19, 19 seems to permeate every aspect of Roland and his traveler's lives. In addition, the number ends up being a powerful key. *In
Jodi Picoult Jodi Lynn Picoult (; born May 19, 1966) is an American writer. Picoult has published 26 novels, accompanying short stories, and has also written several issues of Wonder Woman Wonder Woman is a fictional superheroine appearing in American c ...
's bestselling book ''
Nineteen Minutes ''Nineteen Minutes'' (2007) is the fourteenth novel by the American author, Jodi Picoult. It was Picoult's first book to debut at #1 on the New York Times Best Seller list. This novel follows the unfolding of a school shooting, including the events ...
'', the number 19 is referenced multiple times. It is most commonly referenced when referring to the main subject of the book, the
school shooting A school shooting is an attack at an educational institution An educational institution is a place where people of different ages gain an education Education is the process of facilitating learning, or the acquisition of knowledge, ...
rampage that took place over a span of 19 minutes. *The novel '' S.'' by
Doug Dorst Doug Dorst is an American novelist, short story writer, and creative writing instructor. Dorst is a graduate of the Iowa Writers' Workshop and the Stegner Fellowship at Stanford University. He is the current director of the MFA Program in Creativ ...
uses 19 and its multiples throughout. S is the 19th letter of the alphabet.

# Games

*The game of Go is played on a grid of 19×19 lines (though variants can be played on grids of other sizes). *Though the maximum score for a
cribbage Cribbage, or crib, is a card game A card game is any game A game is a structured form of play Play most commonly refers to: * Play (activity), an activity done for enjoyment * Play (theatre), a work of drama Play may refer also ...

hand is 29, there is no combination of cards that adds up to 19 points. Many cribbage players, therefore, jokingly refer to a zero-point hand as "a 19 hand." *In Ecuadorian card game "40", when counting the number of cards gathered in a hand, the limit is 19, after which the count starts at 6 and represents the points achieved during that hand.

# Age 19

*In four countries, 19 is the
age of majority The age of majority is the threshold of adulthood as recognized or declared in law. It is the moment when minor (law), minors cease to be considered such and assume legal control over their persons, actions, and decisions, thus terminating the ...

. *In two countries, 19 is the minimum
legal drinking age The legal drinking age is the minimum age at which a person can legally Law is a system A system is a group of Interaction, interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, ...
. *In three countries, 19 is the minimum
legal smoking age The smoking age is the minimum legal age required to purchase or use tobacco products. Most countries have laws that forbid sale of tobacco products to persons younger than certain ages, usually the age of majority. This article does not discuss ...
.

# In sports

* In
golf Golf is a club-and-ball sport Sport pertains to any form of competitive Competition is a rivalry A rivalry is the state of two people or groups engaging in a lasting competitive relationship. Rivalry is the "against each other" ...

, the '19th hole' is the clubhouse bar and in match play, if there is a tie after 18 holes, an extra hole(s) is played. In
miniature golf Miniature golf, also known as minigolf, mini-putt, goofy golf, crazy golf, or putt-putt, is an offshoot of the sport of golf focusing solely on the putting aspect of its parent game. The aim of the game is to score the lowest number of points. ...
it is an extra hole on which the winner earns an instant prize.

# Other fields

* The 19th Amendment to the United States Constitution gave American women the right to vote. * The
Vietnam War {{Infobox military conflict , conflict = Vietnam War , partof = the Indochina Wars The Indochina Wars ( vi, Chiến tranh Đông Dương) were a series of wars fought in Southeast Asia Southeast Asia, also spelled ...
spanned over 19 years, from November 1955 to April 1975.