31664669 has 8 divisors (see below), whose sum is σ = 32923968. Its totient is φ = 30428640.

The previous prime is 31664663. The next prime is 31664729. The reversal of 31664669 is 96646613.

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

It is a cyclic number.

It is not a de Polignac number, because 31664669 - 2⁴ = 31664653 is a prime.

It is a super-2 number, since 2×31664669² = 2005302525759122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31664663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3017 + ... + 8510.

It is an arithmetic number, because the mean of its divisors is an integer number (4115496).

Almost surely, 2^31664669 is an apocalyptic number.

It is an amenable number.

31664669 is a deficient number, since it is larger than the sum of its proper divisors (1259299).

31664669 is a wasteful number, since it uses less digits than its factorization.

31664669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11635.

The product of its digits is 139968, while the sum is 41.

The square root of 31664669 is about 5627.1368385707. The cubic root of 31664669 is about 316.3673457264.

The spelling of 31664669 in words is "thirty-one million, six hundred sixty-four thousand, six hundred sixty-nine".