31311021130117 has 2 divisors, whose sum is σ = 31311021130118. Its totient is φ = 31311021130116.

The previous prime is 31311021130079. The next prime is 31311021130121. The reversal of 31311021130117 is 71103112011313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26083757415076 + 5227263715041 = 5107226^2 + 2286321^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311021130117 - 2³¹ = 31308873646469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31311021130091 and 31311021130100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31311021130177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655510565058 + 15655510565059.

It is an arithmetic number, because the mean of its divisors is an integer number (15655510565059).

Almost surely, 2^{31311021130117} is an apocalyptic number.

It is an amenable number.

31311021130117 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311021130117 is an equidigital number, since it uses as much as digits as its factorization.

31311021130117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 25.

The spelling of 31311021130117 in words is "thirty-one trillion, three hundred eleven billion, twenty-one million, one hundred thirty thousand, one hundred seventeen".