117917791 has 8 divisors (see below), whose sum is σ = 119707200. Its totient is φ = 116138880.

The previous prime is 117917777. The next prime is 117917837. The reversal of 117917791 is 197719711.

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 117917791 - 2⁷ = 117917663 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 (117917771) 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, 21675 + ... + 26563.

It is an arithmetic number, because the mean of its divisors is an integer number (14963400).

Almost surely, 2^117917791 is an apocalyptic number.

117917791 is a deficient number, since it is larger than the sum of its proper divisors (1789409).

117917791 is an equidigital number, since it uses as much as digits as its factorization.

117917791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5249.

The product of its digits is 27783, while the sum is 43.

The square root of 117917791 is about 10858.9958559712. The cubic root of 117917791 is about 490.3728815194.

The spelling of 117917791 in words is "one hundred seventeen million, nine hundred seventeen thousand, seven hundred ninety-one".