31312112013 has 48 divisors (see below), whose sum is σ = 55815760000. Its totient is φ = 16471838592.

The previous prime is 31312111981. The next prime is 31312112053. The reversal of 31312112013 is 31021121313.

It is not a de Polignac number, because 31312112013 - 2⁵ = 31312111981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312112053) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 254238 + ... + 356736.

Almost surely, 2^31312112013 is an apocalyptic number.

It is an amenable number.

31312112013 is a deficient number, since it is larger than the sum of its proper divisors (24503647987).

31312112013 is a wasteful number, since it uses less digits than its factorization.

31312112013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102898 (or 102895 counting only the distinct ones).

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

Adding to 31312112013 its reverse (31021121313), we get a palindrome (62333233326).

The spelling of 31312112013 in words is "thirty-one billion, three hundred twelve million, one hundred twelve thousand, thirteen".