31996865 has 8 divisors (see below), whose sum is σ = 38468520. Its totient is φ = 25549312.

The previous prime is 31996837. The next prime is 31996871. The reversal of 31996865 is 56869913.

It can be written as a sum of positive squares in 4 ways, for example, as 142129 + 31854736 = 377^2 + 5644^2 .

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 31996865 - 2⁸ = 31996609 is a prime.

It is a Curzon number.

It is an unprimeable number.

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, 2960 + ... + 8529.

It is an arithmetic number, because the mean of its divisors is an integer number (4808565).

Almost surely, 2^31996865 is an apocalyptic number.

It is an amenable number.

31996865 is a deficient number, since it is larger than the sum of its proper divisors (6471655).

31996865 is a wasteful number, since it uses less digits than its factorization.

31996865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12051.

The product of its digits is 349920, while the sum is 47.

The square root of 31996865 is about 5656.5771452354. The cubic root of 31996865 is about 317.4698423419.

The spelling of 31996865 in words is "thirty-one million, nine hundred ninety-six thousand, eight hundred sixty-five".