31940017 has 2 divisors, whose sum is σ = 31940018. Its totient is φ = 31940016.

The previous prime is 31940009. The next prime is 31940021. The reversal of 31940017 is 71004913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31091776 + 848241 = 5576^2 + 921^2 .

It is a cyclic number.

It is not a de Polignac number, because 31940017 - 2³ = 31940009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31939973 and 31940000.

It is not a weakly prime, because it can be changed into another prime (31940047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15970008 + 15970009.

It is an arithmetic number, because the mean of its divisors is an integer number (15970009).

Almost surely, 2^31940017 is an apocalyptic number.

It is an amenable number.

31940017 is a deficient number, since it is larger than the sum of its proper divisors (1).

31940017 is an equidigital number, since it uses as much as digits as its factorization.

31940017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 31940017 is about 5651.5499643903. The cubic root of 31940017 is about 317.2817174079.

The spelling of 31940017 in words is "thirty-one million, nine hundred forty thousand, seventeen".