31997117 has 8 divisors (see below), whose sum is σ = 34165824. Its totient is φ = 29893248.

The previous prime is 31997113. The next prime is 31997129. The reversal of 31997117 is 71179913.

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 31997117 - 2² = 31997113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31997113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15188 + ... + 17165.

It is an arithmetic number, because the mean of its divisors is an integer number (4270728).

Almost surely, 2^31997117 is an apocalyptic number.

It is an amenable number.

31997117 is a deficient number, since it is larger than the sum of its proper divisors (2168707).

31997117 is a wasteful number, since it uses less digits than its factorization.

31997117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32419.

The product of its digits is 11907, while the sum is 38.

The square root of 31997117 is about 5656.5994201463. The cubic root of 31997117 is about 317.4706757797.

The spelling of 31997117 in words is "thirty-one million, nine hundred ninety-seven thousand, one hundred seventeen".