117857931 has 16 divisors (see below), whose sum is σ = 165648000. Its totient is φ = 74331648.

The previous prime is 117857921. The next prime is 117857947. The reversal of 117857931 is 139758711.

It is a happy number.

It is not a de Polignac number, because 117857931 - 2⁵ = 117857899 is a prime.

It is a super-2 number, since 2×117857931² = 27780983799201522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (117857921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68520 + ... + 70218.

It is an arithmetic number, because the mean of its divisors is an integer number (10353000).

Almost surely, 2^117857931 is an apocalyptic number.

117857931 is a deficient number, since it is larger than the sum of its proper divisors (47790069).

117857931 is a wasteful number, since it uses less digits than its factorization.

117857931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938.

The product of its digits is 52920, while the sum is 42.

The square root of 117857931 is about 10856.2392659705. The cubic root of 117857931 is about 490.2898895499.

The spelling of 117857931 in words is "one hundred seventeen million, eight hundred fifty-seven thousand, nine hundred thirty-one".