31136635081 has 2 divisors, whose sum is σ = 31136635082. Its totient is φ = 31136635080.

The previous prime is 31136635067. The next prime is 31136635171. The reversal of 31136635081 is 18053663113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27677313225 + 3459321856 = 166365^2 + 58816^2 .

It is a cyclic number.

It is not a de Polignac number, because 31136635081 - 2⁷ = 31136634953 is a prime.

It is a super-2 number, since 2×31136635081² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31136635081.

It is not a weakly prime, because it can be changed into another prime (31136630081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15568317540 + 15568317541.

It is an arithmetic number, because the mean of its divisors is an integer number (15568317541).

Almost surely, 2^31136635081 is an apocalyptic number.

It is an amenable number.

31136635081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31136635081 is an equidigital number, since it uses as much as digits as its factorization.

31136635081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 31136635081 in words is "thirty-one billion, one hundred thirty-six million, six hundred thirty-five thousand, eighty-one".