31000012 has 6 divisors (see below), whose sum is σ = 54250028. Its totient is φ = 15500004.

The previous prime is 31000003. The next prime is 31000063. The reversal of 31000012 is 21000013.

It is a super-2 number, since 2×31000012² = 1922001488000288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30999959 and 31000004.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3874998 + ... + 3875005.

Almost surely, 2^31000012 is an apocalyptic number.

It is an amenable number.

31000012 is a deficient number, since it is larger than the sum of its proper divisors (23250016).

31000012 is a wasteful number, since it uses less digits than its factorization.

31000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7750007 (or 7750005 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 31000012 is about 5567.7654404617. The cubic root of 31000012 is about 314.1381057731.

Adding to 31000012 its reverse (21000013), we get a palindrome (52000025).

Subtracting from 31000012 its reverse (21000013), we obtain a palindrome (9999999).

The spelling of 31000012 in words is "thirty-one million, twelve", and thus it is an aban number and an uban number.