555 (five hundred ndfifty-five) 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

554 __NOTOC__ Year 554 ( DLIV) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. The denomination 554 for this year has been used since the early medieval period, when the Anno Domini calendar era ...

and preceding 556.

In mathematics

It is a

sphenic number In number theory, a sphenic number (from grc, σφήνα, 'wedge') is a positive integer that is the product of three distinct prime numbers. Because there are infinitely many prime numbers, there are also infinitely many sphenic numbers. Definit ...

. In base 10, it is a

repdigit In recreational mathematics, a repdigit or sometimes monodigit is a natural number composed of repeated instances of the same digit in a positional number system (often implicitly decimal). The word is a portmanteau of repeated and digit. Example ...

, and because it is divisible by the sum of its digits, it is a Harshad number. It is also a Harshad number in

binary Binary may refer to: Science and technology Mathematics * Binary number, a representation of numbers using only two digits (0 and 1) * Binary function, a function that takes two arguments * Binary operation, a mathematical operation that ta ...

, base 11, base 13 and hexadecimal. 555 is the sum of the first three-digit

permutable prime A permutable prime, also known as anagrammatic prime, is a prime number which, in a given base, can have its digits' positions switched through any permutation and still be a prime number. H. E. Richert, who is supposedly the first to study the ...

s 113, 131 and 311.

Telephone numbers

The

NANP The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the international calling ...

reserves telephone numbers in many dialing areas in the 555 local block for fictional purposes, such as 1-308-555-3485.

Numerology and Spirituality

In numerology and

New Age New Age is a range of spiritual or religious practices and beliefs which rapidly grew in Western society during the early 1970s. Its highly eclectic and unsystematic structure makes a precise definition difficult. Although many scholars consi ...

spirituality, the number 555 is considered an angel number, which is a symbol that conveys messages from one's spirit guides, or the metaphysical world. Some of the meanings applied to the 555 angel number are derived from the 6th century BCE philosopher

Pythagoras Pythagoras of Samos ( grc, Πυθαγόρας ὁ Σάμιος, Pythagóras ho Sámios, Pythagoras the Samian, or simply ; in Ionian Greek; ) was an ancient Ionian Greek philosopher and the eponymous founder of Pythagoreanism. His politi ...

, who believed in the sacred power of numbers, as well as from other esoteric beliefs, including numerology,

astrology Astrology is a range of divinatory practices, recognized as pseudoscientific since the 18th century, that claim to discern information about human affairs and terrestrial events by studying the apparent positions of celestial objects. Di ...

, and the

tarot The tarot (, first known as '' trionfi'' and later as ''tarocchi'' or ''tarocks'') is a pack of playing cards, used from at least the mid-15th century in various parts of Europe to play card games such as Tarocchini. From their Italian roots ...

. While meanings vary depending on the interpreter, the angel number 555 is generally associated with change, transformation, healing, and good

luck Luck is the phenomenon and belief that defines the experience of improbable events, especially improbably positive or negative ones. The naturalistic interpretation is that positive and negative events may happen at any time, both due to rand ...

External links

* {{Integers, 5 Integers