31013208917917 has 2 divisors, whose sum is σ = 31013208917918. Its totient is φ = 31013208917916.

The previous prime is 31013208917909. The next prime is 31013208917939. The reversal of 31013208917917 is 71971980231013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21834181362436 + 9179027555481 = 4672706^2 + 3029691^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013208917917 - 2³ = 31013208917909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31013208917417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506604458958 + 15506604458959.

It is an arithmetic number, because the mean of its divisors is an integer number (15506604458959).

Almost surely, 2^{31013208917917} is an apocalyptic number.

It is an amenable number.

31013208917917 is a deficient number, since it is larger than the sum of its proper divisors (1).

31013208917917 is an equidigital number, since it uses as much as digits as its factorization.

31013208917917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 52.

The spelling of 31013208917917 in words is "thirty-one trillion, thirteen billion, two hundred eight million, nine hundred seventeen thousand, nine hundred seventeen".