|Cardinal||One hundred [and]|
One hundred [and] twenty-seven is a Mersenne prime, 27 - 1, and as such, in binary it is a repunit prime, a permutable prime and a palindromic prime. This also means it is the largest integer that can be represented by a signed byte. As a Mersenne prime, 127 is related to the perfect number 8128, and 2127 - 1 is also a Mersenne prime, making it a double Mersenne prime. 127 is also a cuban prime of the form , . 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 a centered hexagonal number.
It is the 7th Motzkin number.
It is a nice Friedman number in base 10, since 127 = -1 + 27, as well as binary since 1111111 = (1 + 1)111 - 1 * 1.
In other fields
One hundred [and] twenty-seven is also:
- ASCII and Unicode code point for delete.
- The number of provinces ruled by King Xerxes I, "from India to Ethiopia" (Holy Bible, Esther 1:1).
- The number of sons of Bethlehem at the Census of men of Israel upon return from exile (Holy Bible, Ezra 2:21).
- The year AD 127 or 127 BC.