31013497661 has 2 divisors, whose sum is σ = 31013497662. Its totient is φ = 31013497660.

The previous prime is 31013497561. The next prime is 31013497687. The reversal of 31013497661 is 16679431013.

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., 19133805625 + 11879692036 = 138325^2 + 108994^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013497661 - 2³⁴ = 13833628477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31013497561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506748830 + 15506748831.

It is an arithmetic number, because the mean of its divisors is an integer number (15506748831).

Almost surely, 2^31013497661 is an apocalyptic number.

It is an amenable number.

31013497661 is a deficient number, since it is larger than the sum of its proper divisors (1).

31013497661 is an equidigital number, since it uses as much as digits as its factorization.

31013497661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The spelling of 31013497661 in words is "thirty-one billion, thirteen million, four hundred ninety-seven thousand, six hundred sixty-one".