127 (number)
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127 (one hundred ndtwenty-seven) 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 ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called '' cardinal ...
following 126 and preceding
128 128 may refer to * 128 (number), a natural number * AD 128, a year in the 2nd century AD * 128 BC, a year in the 2nd century BC * 128 (New Jersey bus) See also * List of highways numbered * * 12/8 (disambiguation) {{numberdis ...
. It is also a prime number.


In mathematics

*As a
Mersenne prime In mathematics, a Mersenne prime is a prime number that is one less than a power of two. That is, it is a prime number of the form for some integer . They are named after Marin Mersenne, a French Minim friar, who studied them in the early 17 ...
, 127 is related to the
perfect number In number theory, a perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. For instance, 6 has divisors 1, 2 and 3 (excluding itself), and 1 + 2 + 3 = 6, so 6 is a perfect number. ...
8128. 127 is also the largest known mersenne prime exponent for a Mersenne number, 2^-1, which is also a Mersenne prime. It was discovered by Édouard Lucas in 1876 and held the record for the largest known prime for 75 years. **2^-1 is the largest prime ever discovered by hand calculations as well as the largest known double Mersenne prime. ** Furthermore, 127 is equal to 2^-1, and 7 is equal to 2^-1, and 3 is the smallest Mersenne prime, making 7 the smallest double Mersenne prime and 127 the smallest triple Mersenne prime. *There are a total of 127
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 ...
s between 2,000 and 3,000. *127 is also a cuban prime of the form p=\frac, x=y+1. The next prime is 131, with which it comprises a
cousin prime In number theory, cousin primes are prime numbers that differ by four. Compare this with twin primes, pairs of prime numbers that differ by two, and sexy primes, pairs of prime numbers that differ by six. The cousin primes (sequences and in ...
. Because the next
odd number In mathematics, parity is the property of an integer of whether it is even or odd. An integer is even if it is a multiple of two, and odd if it is not.. For example, −4, 0, 82 are even because \begin -2 \cdot 2 &= -4 \\ 0 \cdot 2 &= 0 \\ 41 ...
, 129, is a
semiprime In mathematics, a semiprime is a natural number that is the product of exactly two prime numbers. The two primes in the product may equal each other, so the semiprimes include the squares of prime numbers. Because there are infinitely many prime ...
, 127 is a Chen prime. 127 is greater than the arithmetic mean of its two neighboring primes; thus, it is a
strong prime In mathematics, a strong prime is a prime number with certain special properties. The definitions of strong primes are different in cryptography and number theory. Definition in number theory In number theory, a strong prime is a prime number t ...
. *127 is a
centered hexagonal number In mathematics and combinatorics, a centered hexagonal number, or hex number, is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in a hexagonal lattice. The following ...
. *It is the seventh Motzkin number. *127 is a
palindromic prime In mathematics, a palindromic prime (sometimes called a palprime) is a prime number that is also a palindromic number. Palindromicity depends on the Radix, base of the number system and its notational conventions, while primality is independent of ...
in
nonary A ternary numeral system (also called base 3 or trinary) has 3 (number), three as its radix, base. Analogous to a bit, a ternary numerical digit, digit is a trit (trinary digit). One trit is equivalent to binary logarithm, log2 3 (about 1.5 ...
and binary. *127 is the first
Friedman prime A Friedman number is an integer, which represented in a given numeral system, is the result of a non-trivial expression using all its own digits in combination with any of the four basic arithmetic operators (+, −, ×, ÷), additive inverses, pa ...
in decimal. It is also the first nice Friedman number in decimal, since 127=2^-1 \,, as well as binary since 1111111 = (1 + 1)^ - 1 \, . *127 is the sum of the sums of the divisors of the first twelve
positive integers In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called '' cardinal ...
. *127 is the smallest prime that can be written as the sum of the first two or more odd primes: 127 = 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29. *127 is the smallest odd number that cannot be written in the form p+2^, for 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 ...
, and is an
integer An integer is the number zero (), a positive natural number (, , , etc.) or a negative integer with a minus sign ( −1, −2, −3, etc.). The negative numbers are the additive inverses of the corresponding positive numbers. In the languag ...
, since 127 - 20 = 126, 127 - 21 = 125, 127 - 22 = 123, 127 - 23 = 119, 127 - 24 = 111, 127 - 25 = 95, and 127 - 26 = 63 are all
composite number A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Equivalently, it is a positive integer that has at least one divisor In mathematics, a divisor of an integer n, also called a factor ...
s. *127 is an isolated prime where neither p-2 nor p+2 are prime. *127 is the smallest digitally delicate prime in binary. *127 is the 31st prime number and therefore it is the smallest
Mersenne prime In mathematics, a Mersenne prime is a prime number that is one less than a power of two. That is, it is a prime number of the form for some integer . They are named after Marin Mersenne, a French Minim friar, who studied them in the early 17 ...
with a Mersenne prime index. *127 is the largest number with the property 127 = 1*prime(1) + 2*prime(2) + 7*prime(7). Where prime(n) is the n-th prime number. There are only two numbers with that property, the other one is 43. *127 is the number of different ways in which 10,000 can be expressed as the sum of two prime numbers.


In the military

* was a ''Mission Buenaventura''-class
fleet oilers A replenishment oiler or replenishment tanker is a naval auxiliary ship with fuel tanks and dry cargo holds which can supply both fuel and dry stores during underway replenishment (UNREP) at sea. Many countries have used replenishment oilers. The ...
during
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...
* was a
United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...
transport Transport (in British English), or transportation (in American English), is the intentional movement of humans, animals, and goods from one location to another. Modes of transport include air, land ( rail and road), water, cable, pipelin ...
ship * was a United States Navy * was a United States Navy in World War II * was a United States Navy * was a United States Navy for removing naval mines


In religion

* The biblical figure
Sarah Sarah (born Sarai) is a biblical matriarch and prophetess, a major figure in Abrahamic religions. While different Abrahamic faiths portray her differently, Judaism, Christianity, and Islam all depict her character similarly, as that of a pio ...
died at the age of 127. * According to the Book of , the
Persian Empire The Achaemenid Empire or Achaemenian Empire (; peo, 𐎧𐏁𐏂, , ), also called the First Persian Empire, was an ancient Iranian empire founded by Cyrus the Great in 550 BC. Based in Western Asia, it was contemporarily the largest emp ...
under Ahasuerus contained 127 provinces * Havamal
Stanza In poetry, a stanza (; from Italian ''stanza'' , "room") is a group of lines within a poem, usually set off from others by a blank line or indentation. Stanzas can have regular rhyme and metrical schemes, but they are not required to have ei ...
127 is used as a declaration against folkish traditions of Heathenry and specifically the
Asatru Folk Assembly The Asatru Folk Assembly (AFA) is a white supremacist international Ásatrú organization, founded by Stephen A. McNallen in 1994. Many of the assembly's doctrines, heavily criticized by most heathens, are based on ethnicity, an approach it ca ...
.


In transportation

* The small Fiat 127 automobile *
London Buses route 127 This is a list of Transport for London (TfL) contracted bus routes in London, England, as well as commercial services that enter the Greater London area (except coaches). Bus services in London are operated by Abellio London, Arriva Londo ...
is a Transport for London contracted bus route in
London London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...
* 127 is the number of many roads, including U.S. Route 127 * STS-127 was a Space Shuttle ''Endeavour'' mission to the
International Space Station The International Space Station (ISS) is the largest Modular design, modular space station currently in low Earth orbit. It is a multinational collaborative project involving five participating space agencies: NASA (United States), Roscosmos ( ...
which launched on June 15, 2009


In other fields

* '' 127 Hours'' is a film released in 2010 * The year
AD 127 Year 127 ( CXXVII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Rufus and Squilla (or, less frequently, year 880 ''Ab urbe condita ...
or 127 BC * 127 AH is a year in the
Islamic calendar The Hijri calendar ( ar, ٱلتَّقْوِيم ٱلْهِجْرِيّ, translit=al-taqwīm al-hijrī), also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 ...
that corresponds to
744 __NOTOC__ Year 744 ( DCCXLIV) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar. The denomination 744 for this year has been used since the early medieval period, when the Anno Domini calendar e ...
745 __NOTOC__ Year 745 ( DCCXLV) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 745 for this year has been used since the early medieval period, when the Anno Domini calendar era ...
CE * 127 Johanna, a Main belt asteroid * 127 film, a film format * The
atomic number The atomic number or nuclear charge number (symbol ''Z'') of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei, this is equal to the proton number (''n''p) or the number of protons found in the nucleus of ever ...
of
Unbiseptium An extended periodic table theorises about chemical elements beyond those currently known in the periodic table and proven. , the element with the highest atomic number known is oganesson (''Z'' = 118), which completes the seventh period (row) ...
, an element that has not yet been discovered * The LZ 127 ''Graf Zeppelin'', a dirigible *
Sonnet 127 Sonnet 127 of '' Shakespeare's sonnets'' (1609) is the first of the Dark Lady sequence (sonnets 127–152), called so because the poems make it clear that the speaker's mistress has black hair and eyes and dark skin. In this poem the speaker fi ...
by
William Shakespeare William Shakespeare ( 26 April 1564 – 23 April 1616) was an English playwright, poet and actor. He is widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's nation ...
* 127th Street Ensemble was a troupe of
African-American African Americans (also referred to as Black Americans and Afro-Americans) are an ethnic group consisting of Americans with partial or total ancestry from sub-Saharan Africa. The term "African American" generally denotes descendants of ensl ...
actors which included Tupac Amaru Shakur *
NCT 127 NCT 127 () is the first fixed and second overall sub-unit of the South Korean boy band NCT, formed and managed by SM Entertainment. The current lineup consists of nine active members: Taeil, Johnny, Taeyong, Yuta, Doyoung, Jaehyun, Jungwo ...
, K-pop boy group under SM Entertainment * In IP (Internet Protocol) Version 4, it is the last Class A network and is also the subnet used for loopback functionality in computer networking * The highest signed 8-bit integer, using
two's complement Two's complement is a mathematical operation to reversibly convert a positive binary number into a negative binary number with equivalent (but negative) value, using the binary digit with the greatest place value (the leftmost bit in big- endian ...
* The non-printable " Delete" (DEL) control character in
ASCII ASCII ( ), abbreviated from American Standard Code for Information Interchange, is a character encoding standard for electronic communication. ASCII codes represent text in computers, telecommunications equipment, and other devices. Because ...
. * Linotype (and Intertype) machines used brass matrices with one of 127 possible combinations punched into the top to enable the matrices to return to their proper channel in the magazine. * 127 is the smallest positive integer, ''n'', such that ''n'' centimeters is a whole number of inches. 127 cm is exactly 50 inches.


See also

* 127th (disambiguation) *
List of highways numbered 127 Route 127 or Highway 127 can refer to multiple roads: Canada * New Brunswick Route 127 * Ontario Highway 127 * Prince Edward Island Route 127 Costa Rica * National Route 127 India * National Highway 127 (India) Japan * Japan National Route 1 ...
* United Nations Security Council Resolution 127


References

* Wells, D. '' The Penguin Dictionary of Curious and Interesting Numbers'' London: Penguin Group. (1987): 136 - 138 {{DEFAULTSORT:127 (Number) Integers