31513012 has 12 divisors (see below), whose sum is σ = 55242880. Its totient is φ = 15729336.

The previous prime is 31513007. The next prime is 31513033. The reversal of 31513012 is 21031513.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4062 + ... + 8917.

Almost surely, 2^31513012 is an apocalyptic number.

It is an amenable number.

31513012 is a deficient number, since it is larger than the sum of its proper divisors (23729868).

31513012 is a wasteful number, since it uses less digits than its factorization.

31513012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13590 (or 13588 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 31513012 is about 5613.6451615684. The cubic root of 31513012 is about 315.8614598600.

Adding to 31513012 its reverse (21031513), we get a palindrome (52544525).

The spelling of 31513012 in words is "thirty-one million, five hundred thirteen thousand, twelve".