31899388841 has 2 divisors, whose sum is σ = 31899388842. Its totient is φ = 31899388840.

The previous prime is 31899388799. The next prime is 31899388849. The reversal of 31899388841 is 14888399813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31899388816 + 25 = 178604^2 + 5^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31899388841 is a prime.

It is not a weakly prime, because it can be changed into another prime (31899388849) 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, 15949694420 + 15949694421.

It is an arithmetic number, because the mean of its divisors is an integer number (15949694421).

Almost surely, 2^31899388841 is an apocalyptic number.

It is an amenable number.

31899388841 is a deficient number, since it is larger than the sum of its proper divisors (1).

31899388841 is an equidigital number, since it uses as much as digits as its factorization.

31899388841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11943936, while the sum is 62.

The spelling of 31899388841 in words is "thirty-one billion, eight hundred ninety-nine million, three hundred eighty-eight thousand, eight hundred forty-one".