31310120917 has 2 divisors, whose sum is σ = 31310120918. Its totient is φ = 31310120916.

The previous prime is 31310120911. The next prime is 31310121023. The reversal of 31310120917 is 71902101313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31283350641 + 26770276 = 176871^2 + 5174^2 .

It is a cyclic number.

It is not a de Polignac number, because 31310120917 - 2¹⁵ = 31310088149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31310120911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655060458 + 15655060459.

It is an arithmetic number, because the mean of its divisors is an integer number (15655060459).

Almost surely, 2^31310120917 is an apocalyptic number.

It is an amenable number.

31310120917 is a deficient number, since it is larger than the sum of its proper divisors (1).

31310120917 is an equidigital number, since it uses as much as digits as its factorization.

31310120917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 28.

The spelling of 31310120917 in words is "thirty-one billion, three hundred ten million, one hundred twenty thousand, nine hundred seventeen".