31013912 has 8 divisors (see below), whose sum is σ = 58151100. Its totient is φ = 15506952.

The previous prime is 31013911. The next prime is 31013929. The reversal of 31013912 is 21931013.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31013911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1938362 + ... + 1938377.

Almost surely, 2^31013912 is an apocalyptic number.

It is an amenable number.

31013912 is a deficient number, since it is larger than the sum of its proper divisors (27137188).

31013912 is a wasteful number, since it uses less digits than its factorization.

31013912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876745 (or 3876741 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 31013912 is about 5569.0135571751. The cubic root of 31013912 is about 314.1850505635.

Adding to 31013912 its reverse (21931013), we get a palindrome (52944925).

The spelling of 31013912 in words is "thirty-one million, thirteen thousand, nine hundred twelve".