511 (number)

511 is the natural number following 510 and preceding 512.
It is a Mersenne number, being one less than a power of 2:.
As a result, 511 is a palindromic number and a repdigit in bases 2. It is also palindromic and a repdigit in base 8.
It is a generalized heptagonal number, since
when.
It is a Harshad number in bases 3, 5, 7, 10, 13 and 15.

Special use in computers

The octal representation of 511 is commonly used by Unix commands to specify a custom record separator in order to "slurp" input as a whole, rather than line-by-line.