31456661317 has 2 divisors, whose sum is σ = 31456661318. Its totient is φ = 31456661316.

The previous prime is 31456661287. The next prime is 31456661339. The reversal of 31456661317 is 71316665413.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31060890081 + 395771236 = 176241^2 + 19894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31456661317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31456661377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15728330658 + 15728330659.

It is an arithmetic number, because the mean of its divisors is an integer number (15728330659).

Almost surely, 2^31456661317 is an apocalyptic number.

It is an amenable number.

31456661317 is a deficient number, since it is larger than the sum of its proper divisors (1).

31456661317 is an equidigital number, since it uses as much as digits as its factorization.

31456661317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 43.

The spelling of 31456661317 in words is "thirty-one billion, four hundred fifty-six million, six hundred sixty-one thousand, three hundred seventeen".