31113558372 has 192 divisors, whose sum is σ = 84587328000. Its totient is φ = 8815779840.

The previous prime is 31113558347. The next prime is 31113558397. The reversal of 31113558372 is 27385531113.

It is an interprime number because it is at equal distance from previous prime (31113558347) and next prime (31113558397).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 31113558372.

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, 28054954 + ... + 28056062.

It is an arithmetic number, because the mean of its divisors is an integer number (440559000).

Almost surely, 2^31113558372 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 31113558372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42293664000).

31113558372 is an abundant number, since it is smaller than the sum of its proper divisors (53473769628).

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

31113558372 is a wasteful number, since it uses less digits than its factorization.

31113558372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366 (or 1364 counting only the distinct ones).

The product of its digits is 75600, while the sum is 39.

The spelling of 31113558372 in words is "thirty-one billion, one hundred thirteen million, five hundred fifty-eight thousand, three hundred seventy-two".