255638331 has 24 divisors (see below), whose sum is σ = 418592720. Its totient is φ = 149034816.

The previous prime is 255638309. The next prime is 255638351. The reversal of 255638331 is 133836552.

It is not a de Polignac number, because 255638331 - 2⁶ = 255638267 is a prime.

It is a super-2 number, since 2×255638331² = 130701912552931122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (255638351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55276 + ... + 59721.

Almost surely, 2^255638331 is an apocalyptic number.

255638331 is a deficient number, since it is larger than the sum of its proper divisors (162954389).

255638331 is a wasteful number, since it uses less digits than its factorization.

255638331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115035 (or 115032 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 255638331 is about 15988.6938490922. The cubic root of 255638331 is about 634.6612622837.

The spelling of 255638331 in words is "two hundred fifty-five million, six hundred thirty-eight thousand, three hundred thirty-one".