231515056 has 40 divisors (see below), whose sum is σ = 476040960. Its totient is φ = 108837696.

The previous prime is 231515051. The next prime is 231515101. The reversal of 231515056 is 650515132.

231515056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (231515051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16381 + ... + 27043.

It is an arithmetic number, because the mean of its divisors is an integer number (11901024).

Almost surely, 2^231515056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231515056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238020480).

231515056 is an abundant number, since it is smaller than the sum of its proper divisors (244525904).

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

231515056 is a wasteful number, since it uses less digits than its factorization.

231515056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10753 (or 10747 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 231515056 is about 15215.6188175177. The cubic root of 231515056 is about 614.0349338384.

It can be divided in two parts, 2315 and 15056, that added together give a palindrome (17371).

The spelling of 231515056 in words is "two hundred thirty-one million, five hundred fifteen thousand, fifty-six".