31130312100 has 72 divisors (see below), whose sum is σ = 91339028928. Its totient is φ = 8184489600.

The previous prime is 31130312053. The next prime is 31130312123. The reversal of 31130312100 is 121303113.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31130312100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 709459 + ... + 752058.

It is an arithmetic number, because the mean of its divisors is an integer number (1268597624).

Almost surely, 2^31130312100 is an apocalyptic number.

31130312100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31130312100 is an abundant number, since it is smaller than the sum of its proper divisors (60208716828).

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

31130312100 is a wasteful number, since it uses less digits than its factorization.

31130312100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461605 (or 1461598 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 31130312100 its reverse (121303113), we get a palindrome (31251615213).

The spelling of 31130312100 in words is "thirty-one billion, one hundred thirty million, three hundred twelve thousand, one hundred".