255765831 has 16 divisors (see below), whose sum is σ = 349829088. Its totient is φ = 166217280.

The previous prime is 255765827. The next prime is 255765847. The reversal of 255765831 is 138567552.

It is not a de Polignac number, because 255765831 - 2² = 255765827 is a prime.

It is a super-2 number, since 2×255765831² = 130832320614241122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255765871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206145 + ... + 207381.

It is an arithmetic number, because the mean of its divisors is an integer number (21864318).

Almost surely, 2^255765831 is an apocalyptic number.

255765831 is a deficient number, since it is larger than the sum of its proper divisors (94063257).

255765831 is an frugal number, since it uses more digits than its factorization.

255765831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363 (or 1281 counting only the distinct ones).

The product of its digits is 252000, while the sum is 42.

The square root of 255765831 is about 15992.6805445491. The cubic root of 255765831 is about 634.7667574983.

The spelling of 255765831 in words is "two hundred fifty-five million, seven hundred sixty-five thousand, eight hundred thirty-one".