255831 has 8 divisors (see below), whose sum is σ = 347760. Its totient is φ = 167232.

The previous prime is 255803. The next prime is 255839. The reversal of 255831 is 138552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 255831 - 2⁶ = 255767 is a prime.

It is a super-2 number, since 2×255831² = 130899001122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646 + ... + 963.

It is an arithmetic number, because the mean of its divisors is an integer number (43470).

2²⁵⁵⁸³¹ is an apocalyptic number.

255831 is a deficient number, since it is larger than the sum of its proper divisors (91929).

255831 is a wasteful number, since it uses less digits than its factorization.

255831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665.

The product of its digits is 1200, while the sum is 24.

The square root of 255831 is about 505.7973902661. The cubic root of 255831 is about 63.4820665666.

The spelling of 255831 in words is "two hundred fifty-five thousand, eight hundred thirty-one".