231521515522525 has 12 divisors (see below), whose sum is σ = 287886363602400. Its totient is φ = 184701287028080.

The previous prime is 231521515522523. The next prime is 231521515522567. The reversal of 231521515522525 is 525225515125132.

231521515522525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231521515522525 - 2¹ = 231521515522523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231521515522523) 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, 12898125595 + ... + 12898143544.

It is an arithmetic number, because the mean of its divisors is an integer number (23990530300200).

Almost surely, 2^{231521515522525} is an apocalyptic number.

231521515522525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231521515522525 is a deficient number, since it is larger than the sum of its proper divisors (56364848079875).

231521515522525 is a wasteful number, since it uses less digits than its factorization.

231521515522525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25796269508 (or 25796269503 counting only the distinct ones).

The product of its digits is 1500000, while the sum is 46.

The spelling of 231521515522525 in words is "two hundred thirty-one trillion, five hundred twenty-one billion, five hundred fifteen million, five hundred twenty-two thousand, five hundred twenty-five".