31690689 has 16 divisors (see below), whose sum is σ = 44647680. Its totient is φ = 19938960.

The previous prime is 31690679. The next prime is 31690709. The reversal of 31690689 is 98609613.

It is not a de Polignac number, because 31690689 - 2²⁰ = 30642113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31690689.

It is not an unprimeable number, because it can be changed into a prime (31690609) 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, 16594 + ... + 18404.

It is an arithmetic number, because the mean of its divisors is an integer number (2790480).

Almost surely, 2^31690689 is an apocalyptic number.

It is an amenable number.

31690689 is a deficient number, since it is larger than the sum of its proper divisors (12956991).

31690689 is a wasteful number, since it uses less digits than its factorization.

31690689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 31690689 is about 5629.4483743969. The cubic root of 31690689 is about 316.4539788185.

The spelling of 31690689 in words is "thirty-one million, six hundred ninety thousand, six hundred eighty-nine".