31607881685 has 16 divisors (see below), whose sum is σ = 38001528000. Its totient is φ = 25238311296.

The previous prime is 31607881681. The next prime is 31607881717. The reversal of 31607881685 is 58618870613.

It is a cyclic number.

It is not a de Polignac number, because 31607881685 - 2² = 31607881681 is a prime.

It is a super-2 number, since 2×31607881685² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31607881681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8042801 + ... + 8046729.

It is an arithmetic number, because the mean of its divisors is an integer number (2375095500).

Almost surely, 2^31607881685 is an apocalyptic number.

It is an amenable number.

31607881685 is a deficient number, since it is larger than the sum of its proper divisors (6393646315).

31607881685 is a wasteful number, since it uses less digits than its factorization.

31607881685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6580.

The product of its (nonzero) digits is 1935360, while the sum is 53.

The spelling of 31607881685 in words is "thirty-one billion, six hundred seven million, eight hundred eighty-one thousand, six hundred eighty-five".