256311 has 16 divisors (see below), whose sum is σ = 414720. Its totient is φ = 155160.

The previous prime is 256307. The next prime is 256313. The reversal of 256311 is 113652.

256311 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 256311 - 2² = 256307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135 + ... + 728.

It is an arithmetic number, because the mean of its divisors is an integer number (25920).

2²⁵⁶³¹¹ is an apocalyptic number.

256311 is a deficient number, since it is larger than the sum of its proper divisors (158409).

256311 is a wasteful number, since it uses less digits than its factorization.

256311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883 (or 877 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 256311 is about 506.2716662030. The cubic root of 256311 is about 63.5217442634.

Adding to 256311 its reverse (113652), we get a palindrome (369963).

It can be divided in two parts, 25 and 6311, that added together give a palindrome (6336).

The spelling of 256311 in words is "two hundred fifty-six thousand, three hundred eleven".