31371311720 has 64 divisors (see below), whose sum is σ = 80701297920. Its totient is φ = 10751583744.

The previous prime is 31371311687. The next prime is 31371311723. The reversal of 31371311720 is 2711317313.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31371311723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 724604 + ... + 766676.

It is an arithmetic number, because the mean of its divisors is an integer number (1260957780).

Almost surely, 2^31371311720 is an apocalyptic number.

It is an amenable number.

31371311720 is an abundant number, since it is smaller than the sum of its proper divisors (49329986200).

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

31371311720 is a wasteful number, since it uses less digits than its factorization.

31371311720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44754 (or 44750 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 29.

The spelling of 31371311720 in words is "thirty-one billion, three hundred seventy-one million, three hundred eleven thousand, seven hundred twenty".