255813 has 8 divisors (see below), whose sum is σ = 346176. Its totient is φ = 168000.

The previous prime is 255803. The next prime is 255839. The reversal of 255813 is 318552.

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

It is not a de Polignac number, because 255813 - 2¹⁴ = 239429 is a prime.

It is a Curzon number.

255813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388 + ... + 813.

It is an arithmetic number, because the mean of its divisors is an integer number (43272).

2²⁵⁵⁸¹³ is an apocalyptic number.

It is an amenable number.

255813 is a deficient number, since it is larger than the sum of its proper divisors (90363).

255813 is a wasteful number, since it uses less digits than its factorization.

255813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275.

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

The square root of 255813 is about 505.7795962670. The cubic root of 255813 is about 63.4805776879.

The spelling of 255813 in words is "two hundred fifty-five thousand, eight hundred thirteen".