117645591 has 16 divisors (see below), whose sum is σ = 179460864. Its totient is φ = 67154304.

The previous prime is 117645581. The next prime is 117645601. The reversal of 117645591 is 195546711.

It is an interprime number because it is at equal distance from previous prime (117645581) and next prime (117645601).

It is not a de Polignac number, because 117645591 - 2²⁵ = 84091159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117645551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22015 + ... + 26831.

It is an arithmetic number, because the mean of its divisors is an integer number (11216304).

Almost surely, 2^117645591 is an apocalyptic number.

117645591 is a deficient number, since it is larger than the sum of its proper divisors (61815273).

117645591 is a wasteful number, since it uses less digits than its factorization.

117645591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5990.

The product of its digits is 37800, while the sum is 39.

The square root of 117645591 is about 10846.4552274003. The cubic root of 117645591 is about 489.9952672040.

The spelling of 117645591 in words is "one hundred seventeen million, six hundred forty-five thousand, five hundred ninety-one".