231515000002150 has 24 divisors (see below), whose sum is σ = 430723625376744. Its totient is φ = 92583263361600.

The previous prime is 231515000002133. The next prime is 231515000002157. The reversal of 231515000002150 is 51200000515132.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231515000002157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 568210296 + ... + 568617595.

It is an arithmetic number, because the mean of its divisors is an integer number (17946817724031).

Almost surely, 2^{231515000002150} is an apocalyptic number.

231515000002150 is a deficient number, since it is larger than the sum of its proper divisors (199208625374594).

231515000002150 is a wasteful number, since it uses less digits than its factorization.

231515000002150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136831976 (or 1136831971 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 231515000002150 its reverse (51200000515132), we get a palindrome (282715000517282).

The spelling of 231515000002150 in words is "two hundred thirty-one trillion, five hundred fifteen billion, two thousand, one hundred fifty".