231231256 has 16 divisors (see below), whose sum is σ = 438431400. Its totient is φ = 114316224.

The previous prime is 231231251. The next prime is 231231257. The reversal of 231231256 is 652132132.

It is a self number, because there is not a number n which added to its sum of digits gives 231231256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231231251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161670 + ... + 163093.

Almost surely, 2^231231256 is an apocalyptic number.

It is an amenable number.

231231256 is a deficient number, since it is larger than the sum of its proper divisors (207200144).

231231256 is a wasteful number, since it uses less digits than its factorization.

231231256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324858 (or 324854 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 231231256 is about 15206.2900143329. The cubic root of 231231256 is about 613.7839287535.

Adding to 231231256 its reverse (652132132), we get a palindrome (883363388).

The spelling of 231231256 in words is "two hundred thirty-one million, two hundred thirty-one thousand, two hundred fifty-six".