31961317 has 2 divisors, whose sum is σ = 31961318. Its totient is φ = 31961316.

The previous prime is 31961311. The next prime is 31961327. The reversal of 31961317 is 71316913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17589636 + 14371681 = 4194^2 + 3791^2 .

It is a cyclic number.

It is not a de Polignac number, because 31961317 - 2¹⁵ = 31928549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31961311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15980658 + 15980659.

It is an arithmetic number, because the mean of its divisors is an integer number (15980659).

Almost surely, 2^31961317 is an apocalyptic number.

It is an amenable number.

31961317 is a deficient number, since it is larger than the sum of its proper divisors (1).

31961317 is an equidigital number, since it uses as much as digits as its factorization.

31961317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 31.

The square root of 31961317 is about 5653.4340891179. The cubic root of 31961317 is about 317.3522308213.

The spelling of 31961317 in words is "thirty-one million, nine hundred sixty-one thousand, three hundred seventeen".