127 (number)

Updated on Dec 07, 2024

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127 128 → Prime 31st		Factorization prime Divisors 1, 127
Cardinal one hundred twenty-seven Ordinal 127th(one hundred and twenty-seventh)

127 (one hundred [and] twenty-seven) is the natural number following 126 and preceding 128. It is also a prime number.

In mathematics

As a Mersenne prime, 127 is related to the perfect number 8128. 127 is also an exponent for another Mersenne prime 2¹²⁷ - 1, which was discovered by Édouard Lucas in 1876, and held the record for the largest known prime for 75 years - it is still the largest prime ever discovered by hand calculations. Furthermore, 127 is equal to 2⁷ - 1, and 7 is equal to 2³ - 1, and 3 is the smallest Mersenne prime, this makes 7 the smallest double Mersenne prime and 127 the smallest triple Mersenne prime.

127 is also a cuban prime of the form p = ( x 3 − y 3 ) / ( x − y ) , x = y + 1 . The next prime is 131, with which it comprises a cousin prime. Because the next odd number, 129, is a semiprime, 127 is a Chen prime. 127 is greater than the arithmetic mean of its two neighboring primes, thus it is a strong prime.

127 is a centered hexagonal number.

It is the 7th Motzkin number.

127 is a palindromic prime in nonary and binary.

It is the first nice Friedman number in base 10, since 127 = -1 + 2⁷, as well as binary since 1111111 = (1 + 1)¹¹¹ - 1 * 1.

127 is the sum of the sums of the divisors of the first 12 positive integers.

127 is the smallest prime that can be written as the sum of 9 regular primes, 127 = 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29.

127 is the smallest odd number that can't be written in the form p + 2^x for p=prime number and x=integer, 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 numbers.

127 is an isolated prime where both p-2 and p+2 isn't prime.

In the military

USNS Mission San Luis Obispo (T-AO-127) was a Mission Buenaventura Class fleet oilers during World War II

USS Admiral W. S. Sims (AP-127) was a United States Navy transport ship

USS Allendale (APA-127) was a United States Navy Haskell-class attack transport ship

USS Alnitah (AK-127) was a United States Navy Crater-class cargo ship in World War II

USS Raccoon (IX-127), was a United States Navy Armadillo-class tanker

USS Tumult (AM-127) was a United States Navy Auk-class minesweeper for removing mines from minefields

In religion

The biblical figure Sarah died at the age of 127.

According to the Book of Esther 1:1, the Persian Empire under Ahasuerus contained 127 provinces

In transportation

The small Fiat 127 automobile

London Buses route 127 is a Transport for London contracted bus route in London

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 which launched on June 15, 2009

In other fields

127 is also:

127 Hours is a film released in 2010

The year AD 127 or 127 BC

127 AH is a year in the Islamic calendar that corresponds to 744 – 745 CE

127 Johanna, a Main belt asteroid

127 film, a film format

The atomic number of Unbiseptium, an element that has not yet been discovered

The LZ 127 Graf Zeppelin, a dirigible

Sonnet 127 by William Shakespeare

127th Street Ensemble was a troupe of African-American actors which included Tupac Amaru Shakur

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

The non-printable "Delete" (DEL) control character in ASCII.

References

127 (number) Wikipedia

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