31613717 has 2 divisors, whose sum is σ = 31613718. Its totient is φ = 31613716.

The previous prime is 31613669. The next prime is 31613719. The reversal of 31613717 is 71731613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31516996 + 96721 = 5614^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 31613717 - 2²⁴ = 14836501 is a prime.

Together with 31613719, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31613717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31613719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15806858 + 15806859.

It is an arithmetic number, because the mean of its divisors is an integer number (15806859).

Almost surely, 2^31613717 is an apocalyptic number.

It is an amenable number.

31613717 is a deficient number, since it is larger than the sum of its proper divisors (1).

31613717 is an equidigital number, since it uses as much as digits as its factorization.

31613717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 29.

The square root of 31613717 is about 5622.6076690447. The cubic root of 31613717 is about 316.1975644602.

The spelling of 31613717 in words is "thirty-one million, six hundred thirteen thousand, seven hundred seventeen".