31513745868 has 192 divisors, whose sum is σ = 85518720000. Its totient is φ = 8941363200.

The previous prime is 31513745843. The next prime is 31513745881. The reversal of 31513745868 is 86854731513.

It is a self number, because there is not a number n which added to its sum of digits gives 31513745868.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31232148 + ... + 31233156.

It is an arithmetic number, because the mean of its divisors is an integer number (445410000).

Almost surely, 2^31513745868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31513745868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42759360000).

31513745868 is an abundant number, since it is smaller than the sum of its proper divisors (54004974132).

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

31513745868 is a wasteful number, since it uses less digits than its factorization.

31513745868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296 (or 1294 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 51.

The spelling of 31513745868 in words is "thirty-one billion, five hundred thirteen million, seven hundred forty-five thousand, eight hundred sixty-eight".