31583336681 has 12 divisors (see below), whose sum is σ = 34231895820. Its totient is φ = 29126410560.

The previous prime is 31583336671. The next prime is 31583336683. The reversal of 31583336681 is 18663338513.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 15222624400 + 16360712281 = 123380^2 + 127909^2 .

It is not a de Polignac number, because 31583336681 - 2²² = 31579142377 is a prime.

It is a super-2 number, since 2×31583336681² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31583336683) 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 in 11 ways as a sum of consecutive naturals, for example, 93251 + ... + 268071.

It is an arithmetic number, because the mean of its divisors is an integer number (2852657985).

Almost surely, 2^31583336681 is an apocalyptic number.

It is an amenable number.

31583336681 is a deficient number, since it is larger than the sum of its proper divisors (2648559139).

31583336681 is a wasteful number, since it uses less digits than its factorization.

31583336681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175916 (or 175903 counting only the distinct ones).

The product of its digits is 933120, while the sum is 47.

The spelling of 31583336681 in words is "thirty-one billion, five hundred eighty-three million, three hundred thirty-six thousand, six hundred eighty-one".