118118591 has 4 divisors (see below), whose sum is σ = 119288184. Its totient is φ = 116949000.

The previous prime is 118118579. The next prime is 118118597. The reversal of 118118591 is 195811811.

It is a happy number.

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 118118591 - 2¹⁰ = 118117567 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 (118118597) 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, 584645 + ... + 584846.

It is an arithmetic number, because the mean of its divisors is an integer number (29822046).

Almost surely, 2^118118591 is an apocalyptic number.

118118591 is a deficient number, since it is larger than the sum of its proper divisors (1169593).

118118591 is a wasteful number, since it uses less digits than its factorization.

118118591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169592.

The product of its digits is 2880, while the sum is 35.

The square root of 118118591 is about 10868.2377136314. The cubic root of 118118591 is about 490.6510726053.

It can be divided in two parts, 11811 and 8591, that added together give a palindrome (20402).

The spelling of 118118591 in words is "one hundred eighteen million, one hundred eighteen thousand, five hundred ninety-one".