31991417 has 8 divisors (see below), whose sum is σ = 32329440. Its totient is φ = 31655520.

The previous prime is 31991381. The next prime is 31991423. The reversal of 31991417 is 71419913.

It is a happy number.

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 31991417 - 2¹⁴ = 31975033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31901417) 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, 55742 + ... + 56312.

It is an arithmetic number, because the mean of its divisors is an integer number (4041180).

Almost surely, 2^31991417 is an apocalyptic number.

It is an amenable number.

31991417 is a deficient number, since it is larger than the sum of its proper divisors (338023).

31991417 is a wasteful number, since it uses less digits than its factorization.

31991417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063.

The product of its digits is 6804, while the sum is 35.

The square root of 31991417 is about 5656.0955614275. The cubic root of 31991417 is about 317.4518231404.

The spelling of 31991417 in words is "thirty-one million, nine hundred ninety-one thousand, four hundred seventeen".