31681342657 has 8 divisors (see below), whose sum is σ = 32000731136. Its totient is φ = 31363047072.

The previous prime is 31681342643. The next prime is 31681342669. The reversal of 31681342657 is 75624318613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31681342657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31681342457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214893 + ... + 330970.

It is an arithmetic number, because the mean of its divisors is an integer number (4000091392).

Almost surely, 2^31681342657 is an apocalyptic number.

It is an amenable number.

31681342657 is a deficient number, since it is larger than the sum of its proper divisors (319388479).

31681342657 is a wasteful number, since it uses less digits than its factorization.

31681342657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546447.

The product of its digits is 725760, while the sum is 46.

The spelling of 31681342657 in words is "thirty-one billion, six hundred eighty-one million, three hundred forty-two thousand, six hundred fifty-seven".