31131132012 has 18 divisors (see below), whose sum is σ = 78692583788. Its totient is φ = 10377043992.

The previous prime is 31131131963. The next prime is 31131132061. The reversal of 31131132012 is 21023113113.

31131132012 is a `hidden beast` number, since 31 + 1 + 311 + 320 + 1 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (31131131963) and next prime (31131132061).

It is a tau number, because it is divible by the number of its divisors (18).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 432376798 + ... + 432376869.

Almost surely, 2^31131132012 is an apocalyptic number.

It is an amenable number.

31131132012 is an abundant number, since it is smaller than the sum of its proper divisors (47561451776).

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

31131132012 is a wasteful number, since it uses less digits than its factorization.

31131132012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864753677 (or 864753672 counting only the distinct ones).

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

Adding to 31131132012 its reverse (21023113113), we get a palindrome (52154245125).

The spelling of 31131132012 in words is "thirty-one billion, one hundred thirty-one million, one hundred thirty-two thousand, twelve".