31112012317 has 2 divisors, whose sum is σ = 31112012318. Its totient is φ = 31112012316.

The previous prime is 31112012299. The next prime is 31112012357. The reversal of 31112012317 is 71321021113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15693575076 + 15418437241 = 125274^2 + 124171^2 .

It is a cyclic number.

It is not a de Polignac number, because 31112012317 - 2²³ = 31103623709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31112012357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556006158 + 15556006159.

It is an arithmetic number, because the mean of its divisors is an integer number (15556006159).

Almost surely, 2^31112012317 is an apocalyptic number.

It is an amenable number.

31112012317 is a deficient number, since it is larger than the sum of its proper divisors (1).

31112012317 is an equidigital number, since it uses as much as digits as its factorization.

31112012317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The spelling of 31112012317 in words is "thirty-one billion, one hundred twelve million, twelve thousand, three hundred seventeen".