31574884681 has 2 divisors, whose sum is σ = 31574884682. Its totient is φ = 31574884680.

The previous prime is 31574884643. The next prime is 31574884697. The reversal of 31574884681 is 18648847513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20637908281 + 10936976400 = 143659^2 + 104580^2 .

It is a cyclic number.

It is not a de Polignac number, because 31574884681 - 2⁹ = 31574884169 is a prime.

It is a super-2 number, since 2×31574884681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31574887681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15787442340 + 15787442341.

It is an arithmetic number, because the mean of its divisors is an integer number (15787442341).

Almost surely, 2^31574884681 is an apocalyptic number.

It is an amenable number.

31574884681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31574884681 is an equidigital number, since it uses as much as digits as its factorization.

31574884681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5160960, while the sum is 55.

The spelling of 31574884681 in words is "thirty-one billion, five hundred seventy-four million, eight hundred eighty-four thousand, six hundred eighty-one".