31989617 has 12 divisors (see below), whose sum is σ = 35340228. Its totient is φ = 28934400.

The previous prime is 31989593. The next prime is 31989667. The reversal of 31989617 is 71698913.

It can be written as a sum of positive squares in 2 ways, for example, as 16654561 + 15335056 = 4081^2 + 3916^2 .

It is not a de Polignac number, because 31989617 - 2⁸ = 31989361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31989667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28613 + ... + 29709.

It is an arithmetic number, because the mean of its divisors is an integer number (2945019).

Almost surely, 2^31989617 is an apocalyptic number.

It is an amenable number.

31989617 is a deficient number, since it is larger than the sum of its proper divisors (3350611).

31989617 is a wasteful number, since it uses less digits than its factorization.

31989617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360 (or 1349 counting only the distinct ones).

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

The square root of 31989617 is about 5655.9364388225. The cubic root of 31989617 is about 317.4458692102.

It can be divided in two parts, 319896 and 17, that added together give a palindrome (319913).

The spelling of 31989617 in words is "thirty-one million, nine hundred eighty-nine thousand, six hundred seventeen".