231520035214520 has 64 divisors (see below), whose sum is σ = 561184103430720. Its totient is φ = 85454873247744.

The previous prime is 231520035214343. The next prime is 231520035214571. The reversal of 231520035214520 is 25412530025132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75175049 + ... + 78194168.

It is an arithmetic number, because the mean of its divisors is an integer number (8768501616105).

Almost surely, 2^{231520035214520} is an apocalyptic number.

231520035214520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231520035214520 is an abundant number, since it is smaller than the sum of its proper divisors (329664068216200).

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

231520035214520 is a wasteful number, since it uses less digits than its factorization.

231520035214520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153372144 (or 153372140 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 231520035214520 its reverse (25412530025132), we get a palindrome (256932565239652).

The spelling of 231520035214520 in words is "two hundred thirty-one trillion, five hundred twenty billion, thirty-five million, two hundred fourteen thousand, five hundred twenty".