31131312102 has 48 divisors (see below), whose sum is σ = 73819848960. Its totient is φ = 9403378800.

The previous prime is 31131312097. The next prime is 31131312131. The reversal of 31131312102 is 20121313113.

31131312102 is a `hidden beast` number, since 311 + 31 + 312 + 10 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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, 191202 + ... + 314357.

It is an arithmetic number, because the mean of its divisors is an integer number (1537913520).

Almost surely, 2^31131312102 is an apocalyptic number.

31131312102 is an abundant number, since it is smaller than the sum of its proper divisors (42688536858).

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

31131312102 is a wasteful number, since it uses less digits than its factorization.

31131312102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505889 (or 505886 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31131312102 its reverse (20121313113), we get a palindrome (51252625215).

The spelling of 31131312102 in words is "thirty-one billion, one hundred thirty-one million, three hundred twelve thousand, one hundred two".