231531403055320 has 64 divisors (see below), whose sum is σ = 521140720976640. Its totient is φ = 92577889689600.

The previous prime is 231531403055299. The next prime is 231531403055321. The reversal of 231531403055320 is 23550304135132.

It is a self number, because there is not a number n which added to its sum of digits gives 231531403055320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231531403055321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1199604025 + ... + 1199797015.

It is an arithmetic number, because the mean of its divisors is an integer number (8142823765260).

Almost surely, 2^{231531403055320} is an apocalyptic number.

231531403055320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231531403055320 is an abundant number, since it is smaller than the sum of its proper divisors (289609317921320).

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

231531403055320 is a wasteful number, since it uses less digits than its factorization.

231531403055320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204076 (or 204072 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 37.

The spelling of 231531403055320 in words is "two hundred thirty-one trillion, five hundred thirty-one billion, four hundred three million, fifty-five thousand, three hundred twenty".