31940717 has 2 divisors, whose sum is σ = 31940718. Its totient is φ = 31940716.

The previous prime is 31940707. The next prime is 31940719. The reversal of 31940717 is 71704913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24790441 + 7150276 = 4979^2 + 2674^2 .

It is a cyclic number.

It is not a de Polignac number, because 31940717 - 2¹⁰ = 31939693 is a prime.

Together with 31940719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31940719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15970358 + 15970359.

It is an arithmetic number, because the mean of its divisors is an integer number (15970359).

Almost surely, 2^31940717 is an apocalyptic number.

It is an amenable number.

31940717 is a deficient number, since it is larger than the sum of its proper divisors (1).

31940717 is an equidigital number, since it uses as much as digits as its factorization.

31940717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 31940717 is about 5651.6118939644. The cubic root of 31940717 is about 317.2840352483.

The spelling of 31940717 in words is "thirty-one million, nine hundred forty thousand, seven hundred seventeen".