31656123797 has 2 divisors, whose sum is σ = 31656123798. Its totient is φ = 31656123796.

The previous prime is 31656123787. The next prime is 31656123799. The reversal of 31656123797 is 79732165613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26840596561 + 4815527236 = 163831^2 + 69394^2 .

It is a cyclic number.

It is not a de Polignac number, because 31656123797 - 2²⁸ = 31387688341 is a prime.

It is a super-2 number, since 2×31656123797² (a number of 22 digits) contains 22 as substring.

Together with 31656123799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31656123799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15828061898 + 15828061899.

It is an arithmetic number, because the mean of its divisors is an integer number (15828061899).

Almost surely, 2^31656123797 is an apocalyptic number.

It is an amenable number.

31656123797 is a deficient number, since it is larger than the sum of its proper divisors (1).

31656123797 is an equidigital number, since it uses as much as digits as its factorization.

31656123797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 50.

The spelling of 31656123797 in words is "thirty-one billion, six hundred fifty-six million, one hundred twenty-three thousand, seven hundred ninety-seven".