255931 has 4 divisors (see below), whose sum is σ = 275632. Its totient is φ = 236232.

The previous prime is 255923. The next prime is 255947. The reversal of 255931 is 139552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 255931 - 2³ = 255923 is a prime.

It is a super-2 number, since 2×255931² = 131001353522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 255896 and 255905.

It is not an unprimeable number, because it can be changed into a prime (255961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9831 + ... + 9856.

It is an arithmetic number, because the mean of its divisors is an integer number (68908).

2²⁵⁵⁹³¹ is an apocalyptic number.

255931 is a deficient number, since it is larger than the sum of its proper divisors (19701).

255931 is a wasteful number, since it uses less digits than its factorization.

255931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19700.

The product of its digits is 1350, while the sum is 25.

The square root of 255931 is about 505.8962344197. The cubic root of 255931 is about 63.4903368436.

The spelling of 255931 in words is "two hundred fifty-five thousand, nine hundred thirty-one".