231522256 has 40 divisors (see below), whose sum is σ = 523131200. Its totient is φ = 99221472.

The previous prime is 231522251. The next prime is 231522271. The reversal of 231522256 is 652225132.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231522251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15606 + ... + 26581.

It is an arithmetic number, because the mean of its divisors is an integer number (13078280).

Almost surely, 2^231522256 is an apocalyptic number.

It is an amenable number.

231522256 is an abundant number, since it is smaller than the sum of its proper divisors (291608944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231522256 is an equidigital number, since it uses as much as digits as its factorization.

231522256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42216 (or 42196 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 231522256 is about 15215.8554146653. The cubic root of 231522256 is about 614.0412991634.

Adding to 231522256 its reverse (652225132), we get a palindrome (883747388).

The spelling of 231522256 in words is "two hundred thirty-one million, five hundred twenty-two thousand, two hundred fifty-six".