31968217 has 8 divisors (see below), whose sum is σ = 32421312. Its totient is φ = 31518000.

The previous prime is 31968199. The next prime is 31968239. The reversal of 31968217 is 71286913.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31968217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31968257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30492 + ... + 31522.

It is an arithmetic number, because the mean of its divisors is an integer number (4052664).

Almost surely, 2^31968217 is an apocalyptic number.

It is an amenable number.

31968217 is a deficient number, since it is larger than the sum of its proper divisors (453095).

31968217 is a wasteful number, since it uses less digits than its factorization.

31968217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439.

The product of its digits is 18144, while the sum is 37.

The square root of 31968217 is about 5654.0443047433. The cubic root of 31968217 is about 317.3750664764.

The spelling of 31968217 in words is "thirty-one million, nine hundred sixty-eight thousand, two hundred seventeen".