31966945 has 8 divisors (see below), whose sum is σ = 38511144. Its totient is φ = 25473024.

The previous prime is 31966937. The next prime is 31967027. The reversal of 31966945 is 54966913.

It can be written as a sum of positive squares in 4 ways, for example, as 2471184 + 29495761 = 1572^2 + 5431^2 .

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 31966945 - 2³ = 31966937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11154 + ... + 13723.

It is an arithmetic number, because the mean of its divisors is an integer number (4813893).

Almost surely, 2^31966945 is an apocalyptic number.

It is an amenable number.

31966945 is a deficient number, since it is larger than the sum of its proper divisors (6544199).

31966945 is a wasteful number, since it uses less digits than its factorization.

31966945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25139.

The product of its digits is 174960, while the sum is 43.

The square root of 31966945 is about 5653.9318177707. The cubic root of 31966945 is about 317.3708570201.

The spelling of 31966945 in words is "thirty-one million, nine hundred sixty-six thousand, nine hundred forty-five".