31345255520 has 96 divisors (see below), whose sum is σ = 81113205600. Its totient is φ = 11393622016.

The previous prime is 31345255517. The next prime is 31345255561. The reversal of 31345255520 is 2555254313.

It is a super-2 number, since 2×31345255520² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119810 + ... + 277569.

It is an arithmetic number, because the mean of its divisors is an integer number (844929225).

Almost surely, 2^31345255520 is an apocalyptic number.

It is an amenable number.

31345255520 is an abundant number, since it is smaller than the sum of its proper divisors (49767950080).

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

31345255520 is a wasteful number, since it uses less digits than its factorization.

31345255520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397440 (or 397432 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 35.

The spelling of 31345255520 in words is "thirty-one billion, three hundred forty-five million, two hundred fifty-five thousand, five hundred twenty".