118615989 has 4 divisors (see below), whose sum is σ = 158154656. Its totient is φ = 79077324.

The previous prime is 118615979. The next prime is 118616023. The reversal of 118615989 is 989516811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989516811 = 3 ⋅329838937.

It is not a de Polignac number, because 118615989 - 2²⁰ = 117567413 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 (118615909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19769329 + ... + 19769334.

It is an arithmetic number, because the mean of its divisors is an integer number (39538664).

Almost surely, 2^118615989 is an apocalyptic number.

It is an amenable number.

118615989 is a deficient number, since it is larger than the sum of its proper divisors (39538667).

118615989 is an equidigital number, since it uses as much as digits as its factorization.

118615989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39538666.

The product of its digits is 155520, while the sum is 48.

The square root of 118615989 is about 10891.0967767255. The cubic root of 118615989 is about 491.3388195429.

The spelling of 118615989 in words is "one hundred eighteen million, six hundred fifteen thousand, nine hundred eighty-nine".