31368260681 has 2 divisors, whose sum is σ = 31368260682. Its totient is φ = 31368260680.

The previous prime is 31368260587. The next prime is 31368260717. The reversal of 31368260681 is 18606286313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17815575625 + 13552685056 = 133475^2 + 116416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31368260681 is a prime.

It is a super-2 number, since 2×31368260681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31368260981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15684130340 + 15684130341.

It is an arithmetic number, because the mean of its divisors is an integer number (15684130341).

Almost surely, 2^31368260681 is an apocalyptic number.

It is an amenable number.

31368260681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31368260681 is an equidigital number, since it uses as much as digits as its factorization.

31368260681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 31368260681 in words is "thirty-one billion, three hundred sixty-eight million, two hundred sixty thousand, six hundred eighty-one".