31917893 has 8 divisors (see below), whose sum is σ = 37735680. Its totient is φ = 26414640.

The previous prime is 31917889. The next prime is 31917901. The reversal of 31917893 is 39871913.

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

It is not a de Polignac number, because 31917893 - 2² = 31917889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31917893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31917883) 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, 78413 + ... + 78818.

It is an arithmetic number, because the mean of its divisors is an integer number (4716960).

Almost surely, 2^31917893 is an apocalyptic number.

It is an amenable number.

31917893 is a deficient number, since it is larger than the sum of its proper divisors (5817787).

31917893 is a wasteful number, since it uses less digits than its factorization.

31917893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157267.

The product of its digits is 40824, while the sum is 41.

The square root of 31917893 is about 5649.5922861743. The cubic root of 31917893 is about 317.2084429521.

The spelling of 31917893 in words is "thirty-one million, nine hundred seventeen thousand, eight hundred ninety-three".