31312313117 has 2 divisors, whose sum is σ = 31312313118. Its totient is φ = 31312313116.

The previous prime is 31312313113. The next prime is 31312313129. The reversal of 31312313117 is 71131321313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30392343556 + 919969561 = 174334^2 + 30331^2 .

It is a cyclic number.

It is not a de Polignac number, because 31312313117 - 2² = 31312313113 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31312313113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656156558 + 15656156559.

It is an arithmetic number, because the mean of its divisors is an integer number (15656156559).

Almost surely, 2^31312313117 is an apocalyptic number.

It is an amenable number.

31312313117 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312313117 is an equidigital number, since it uses as much as digits as its factorization.

31312313117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 26.

The spelling of 31312313117 in words is "thirty-one billion, three hundred twelve million, three hundred thirteen thousand, one hundred seventeen".