127 (number)
127 is the natural number following 126 and preceding 128.
In mathematics
One hundred 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 , . 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 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.
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