31493866520 has 32 divisors (see below), whose sum is σ = 70866385920. Its totient is φ = 12596624640.

The previous prime is 31493866501. The next prime is 31493866531. The reversal of 31493866520 is 2566839413.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 873164 + ... + 908516.

It is an arithmetic number, because the mean of its divisors is an integer number (2214574560).

Almost surely, 2^31493866520 is an apocalyptic number.

It is an amenable number.

31493866520 is an abundant number, since it is smaller than the sum of its proper divisors (39372519400).

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

31493866520 is a wasteful number, since it uses less digits than its factorization.

31493866520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57635 (or 57631 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 31493866520 in words is "thirty-one billion, four hundred ninety-three million, eight hundred sixty-six thousand, five hundred twenty".