255913 has 4 divisors (see below), whose sum is σ = 292480. Its totient is φ = 219348.

The previous prime is 255907. The next prime is 255917. The reversal of 255913 is 319552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255913 is a prime.

It is a Duffinian number.

255913 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (255917) 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, 18273 + ... + 18286.

It is an arithmetic number, because the mean of its divisors is an integer number (73120).

2²⁵⁵⁹¹³ is an apocalyptic number.

It is an amenable number.

255913 is a deficient number, since it is larger than the sum of its proper divisors (36567).

255913 is an equidigital number, since it uses as much as digits as its factorization.

255913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36566.

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

The square root of 255913 is about 505.8784438973. The cubic root of 255913 is about 63.4888483527.

The spelling of 255913 in words is "two hundred fifty-five thousand, nine hundred thirteen".