31668689 has 16 divisors (see below), whose sum is σ = 35048832. Its totient is φ = 28435968.

The previous prime is 31668673. The next prime is 31668691. The reversal of 31668689 is 98686613.

It is a cyclic number.

It is not a de Polignac number, because 31668689 - 2⁴ = 31668673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31668389) 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, 89537 + ... + 89889.

It is an arithmetic number, because the mean of its divisors is an integer number (2190552).

Almost surely, 2^31668689 is an apocalyptic number.

It is an amenable number.

31668689 is a deficient number, since it is larger than the sum of its proper divisors (3380143).

31668689 is a wasteful number, since it uses less digits than its factorization.

31668689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536.

The product of its digits is 373248, while the sum is 47.

The square root of 31668689 is about 5627.4940248747. The cubic root of 31668689 is about 316.3807333385.

The spelling of 31668689 in words is "thirty-one million, six hundred sixty-eight thousand, six hundred eighty-nine".