31339913 has 16 divisors (see below), whose sum is σ = 34944000. Its totient is φ = 27870480.

The previous prime is 31339883. The next prime is 31339921. The reversal of 31339913 is 31993313.

It is not a de Polignac number, because 31339913 - 2⁸ = 31339657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31339913.

It is not an unprimeable number, because it can be changed into a prime (31339933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157388 + ... + 157586.

It is an arithmetic number, because the mean of its divisors is an integer number (2184000).

Almost surely, 2^31339913 is an apocalyptic number.

It is an amenable number.

31339913 is a deficient number, since it is larger than the sum of its proper divisors (3604087).

31339913 is a wasteful number, since it uses less digits than its factorization.

31339913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452.

The product of its digits is 6561, while the sum is 32.

The square root of 31339913 is about 5598.2062305706. The cubic root of 31339913 is about 315.2820619614.

The spelling of 31339913 in words is "thirty-one million, three hundred thirty-nine thousand, nine hundred thirteen".