31316013 has 6 divisors (see below), whose sum is σ = 45234254. Its totient is φ = 20877336.

The previous prime is 31316003. The next prime is 31316039. The reversal of 31316013 is 31061313.

31316013 is a `hidden beast` number, since 31 + 31 + 601 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28965924 + 2350089 = 5382^2 + 1533^2 .

It is not a de Polignac number, because 31316013 - 2⁵ = 31315981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31316003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1739770 + ... + 1739787.

Almost surely, 2^31316013 is an apocalyptic number.

It is an amenable number.

31316013 is a deficient number, since it is larger than the sum of its proper divisors (13918241).

31316013 is a wasteful number, since it uses less digits than its factorization.

31316013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479563 (or 3479560 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 31316013 is about 5596.0712111266. The cubic root of 31316013 is about 315.2018962680.

Adding to 31316013 its reverse (31061313), we get a palindrome (62377326).

The spelling of 31316013 in words is "thirty-one million, three hundred sixteen thousand, thirteen".