31044874681 has 2 divisors, whose sum is σ = 31044874682. Its totient is φ = 31044874680.

The previous prime is 31044874673. The next prime is 31044874723. The reversal of 31044874681 is 18647844013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22099498281 + 8945376400 = 148659^2 + 94580^2 .

It is a cyclic number.

It is not a de Polignac number, because 31044874681 - 2³ = 31044874673 is a prime.

It is a super-2 number, since 2×31044874681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31044871681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15522437340 + 15522437341.

It is an arithmetic number, because the mean of its divisors is an integer number (15522437341).

Almost surely, 2^31044874681 is an apocalyptic number.

It is an amenable number.

31044874681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31044874681 is an equidigital number, since it uses as much as digits as its factorization.

31044874681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 31044874681 in words is "thirty-one billion, forty-four million, eight hundred seventy-four thousand, six hundred eighty-one".