31669136 has 10 divisors (see below), whose sum is σ = 61358982. Its totient is φ = 15834560.

The previous prime is 31669103. The next prime is 31669139. The reversal of 31669136 is 63196613.

It can be written as a sum of positive squares in only one way, i.e., 31360000 + 309136 = 5600^2 + 556^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31669096 and 31669105.

It is not an unprimeable number, because it can be changed into a prime (31669139) 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 as a sum of consecutive naturals, namely, 989645 + ... + 989676.

Almost surely, 2^31669136 is an apocalyptic number.

It is an amenable number.

31669136 is a deficient number, since it is larger than the sum of its proper divisors (29689846).

31669136 is a wasteful number, since it uses less digits than its factorization.

31669136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979329 (or 1979323 counting only the distinct ones).

The product of its digits is 17496, while the sum is 35.

The square root of 31669136 is about 5627.5337404586. The cubic root of 31669136 is about 316.3822218910.

The spelling of 31669136 in words is "thirty-one million, six hundred sixty-nine thousand, one hundred thirty-six".