256231 has 4 divisors (see below), whose sum is σ = 259200. Its totient is φ = 253264.

The previous prime is 256219. The next prime is 256279. The reversal of 256231 is 132652.

It is a happy number.

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 256231 - 2⁵ = 256199 is a prime.

It is a super-2 number, since 2×256231² = 131308650722, which contains 22 as substring.

It is a Duffinian number.

256231 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 256199 and 256208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256211) 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, 1351 + ... + 1528.

It is an arithmetic number, because the mean of its divisors is an integer number (64800).

2²⁵⁶²³¹ is an apocalyptic number.

256231 is a deficient number, since it is larger than the sum of its proper divisors (2969).

256231 is an equidigital number, since it uses as much as digits as its factorization.

256231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968.

The product of its digits is 360, while the sum is 19.

The square root of 256231 is about 506.1926510727. The cubic root of 256231 is about 63.5151347561.

Adding to 256231 its reverse (132652), we get a palindrome (388883).

The spelling of 256231 in words is "two hundred fifty-six thousand, two hundred thirty-one".