117908591 has 4 divisors (see below), whose sum is σ = 117941712. Its totient is φ = 117875472.

The previous prime is 117908573. The next prime is 117908611. The reversal of 117908591 is 195809711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117908591 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 (117908521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10475 + ... + 18588.

It is an arithmetic number, because the mean of its divisors is an integer number (29485428).

Almost surely, 2^117908591 is an apocalyptic number.

117908591 is a deficient number, since it is larger than the sum of its proper divisors (33121).

117908591 is an equidigital number, since it uses as much as digits as its factorization.

117908591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33120.

The product of its (nonzero) digits is 22680, while the sum is 41.

The square root of 117908591 is about 10858.5722357960. The cubic root of 117908591 is about 490.3601281489.

The spelling of 117908591 in words is "one hundred seventeen million, nine hundred eight thousand, five hundred ninety-one".