117117591 has 4 divisors (see below), whose sum is σ = 156156792. Its totient is φ = 78078392.

The previous prime is 117117551. The next prime is 117117613. The reversal of 117117591 is 195711711.

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

It is a cyclic number.

It is not a de Polignac number, because 117117591 - 2¹⁵ = 117084823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117117551) 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, 19519596 + ... + 19519601.

It is an arithmetic number, because the mean of its divisors is an integer number (39039198).

Almost surely, 2^117117591 is an apocalyptic number.

117117591 is a deficient number, since it is larger than the sum of its proper divisors (39039201).

117117591 is an equidigital number, since it uses as much as digits as its factorization.

117117591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39039200.

The product of its digits is 2205, while the sum is 33.

The square root of 117117591 is about 10822.0881072000. The cubic root of 117117591 is about 489.2611257514.

The spelling of 117117591 in words is "one hundred seventeen million, one hundred seventeen thousand, five hundred ninety-one".