31112302220917 has 2 divisors, whose sum is σ = 31112302220918. Its totient is φ = 31112302220916.

The previous prime is 31112302220891. The next prime is 31112302220921. The reversal of 31112302220917 is 71902220321113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25696879885681 + 5415422335236 = 5069209^2 + 2327106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31112302220917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31112302220977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556151110458 + 15556151110459.

It is an arithmetic number, because the mean of its divisors is an integer number (15556151110459).

Almost surely, 2^{31112302220917} is an apocalyptic number.

It is an amenable number.

31112302220917 is a deficient number, since it is larger than the sum of its proper divisors (1).

31112302220917 is an equidigital number, since it uses as much as digits as its factorization.

31112302220917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The spelling of 31112302220917 in words is "thirty-one trillion, one hundred twelve billion, three hundred two million, two hundred twenty thousand, nine hundred seventeen".