31353907681 has 2 divisors, whose sum is σ = 31353907682. Its totient is φ = 31353907680.

The previous prime is 31353907667. The next prime is 31353907691. The reversal of 31353907681 is 18670935313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19272380625 + 12081527056 = 138825^2 + 109916^2 .

It is a cyclic number.

It is not a de Polignac number, because 31353907681 - 2¹⁷ = 31353776609 is a prime.

It is a super-2 number, since 2×31353907681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31353907601) 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, 15676953840 + 15676953841.

It is an arithmetic number, because the mean of its divisors is an integer number (15676953841).

Almost surely, 2^31353907681 is an apocalyptic number.

It is an amenable number.

31353907681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31353907681 is an equidigital number, since it uses as much as digits as its factorization.

31353907681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 31353907681 in words is "thirty-one billion, three hundred fifty-three million, nine hundred seven thousand, six hundred eighty-one".