231515660 has 48 divisors (see below), whose sum is σ = 508830336. Its totient is φ = 88388352.

The previous prime is 231515653. The next prime is 231515663. The reversal of 231515660 is 66515132.

231515660 is digitally balanced in base 3, 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 (231515663) 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 15 ways as a sum of consecutive naturals, for example, 36269 + ... + 42171.

It is an arithmetic number, because the mean of its divisors is an integer number (10600632).

Almost surely, 2^231515660 is an apocalyptic number.

231515660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231515660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254415168).

231515660 is an abundant number, since it is smaller than the sum of its proper divisors (277314676).

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

231515660 is a wasteful number, since it uses less digits than its factorization.

231515660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002 (or 6000 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 231515660 is about 15215.6386655309. The cubic root of 231515660 is about 614.0354678235.

The spelling of 231515660 in words is "two hundred thirty-one million, five hundred fifteen thousand, six hundred sixty".