31131213112 has 16 divisors (see below), whose sum is σ = 58478927400. Its totient is φ = 15536832480.

The previous prime is 31131213109. The next prime is 31131213149. The reversal of 31131213112 is 21131213113.

It is a self number, because there is not a number n which added to its sum of digits gives 31131213112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3592162 + ... + 3600817.

Almost surely, 2^31131213112 is an apocalyptic number.

It is an amenable number.

31131213112 is a deficient number, since it is larger than the sum of its proper divisors (27347714288).

31131213112 is a wasteful number, since it uses less digits than its factorization.

31131213112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7193526 (or 7193522 counting only the distinct ones).

The product of its digits is 108, while the sum is 19.

Adding to 31131213112 its reverse (21131213113), we get a palindrome (52262426225).

Subtracting from 31131213112 its reverse (21131213113), we obtain a palindrome (9999999999).

The spelling of 31131213112 in words is "thirty-one billion, one hundred thirty-one million, two hundred thirteen thousand, one hundred twelve".