31996817 has 8 divisors (see below), whose sum is σ = 34108800. Its totient is φ = 29927664.

The previous prime is 31996813. The next prime is 31996819. The reversal of 31996817 is 71869913.

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 31996817 - 2² = 31996813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31996813) 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, 9158 + ... + 12159.

It is an arithmetic number, because the mean of its divisors is an integer number (4263600).

Almost surely, 2^31996817 is an apocalyptic number.

It is an amenable number.

31996817 is a deficient number, since it is larger than the sum of its proper divisors (2111983).

31996817 is a wasteful number, since it uses less digits than its factorization.

31996817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21415.

The product of its digits is 81648, while the sum is 44.

The square root of 31996817 is about 5656.5729023853. The cubic root of 31996817 is about 317.4696835914.

The spelling of 31996817 in words is "thirty-one million, nine hundred ninety-six thousand, eight hundred seventeen".