31313713 has 2 divisors, whose sum is σ = 31313714. Its totient is φ = 31313712.

The previous prime is 31313701. The next prime is 31313731. The reversal of 31313713 is 31731313.

Together with next prime (31313731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28601104 + 2712609 = 5348^2 + 1647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31313713 is a prime.

It is not a weakly prime, because it can be changed into another prime (31313743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656856 + 15656857.

It is an arithmetic number, because the mean of its divisors is an integer number (15656857).

Almost surely, 2^31313713 is an apocalyptic number.

It is an amenable number.

31313713 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313713 is an equidigital number, since it uses as much as digits as its factorization.

31313713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567, while the sum is 22.

The square root of 31313713 is about 5595.8657060369. The cubic root of 31313713 is about 315.1941794267.

The spelling of 31313713 in words is "thirty-one million, three hundred thirteen thousand, seven hundred thirteen".