118508591 has 2 divisors, whose sum is σ = 118508592. Its totient is φ = 118508590.

The previous prime is 118508563. The next prime is 118508603. The reversal of 118508591 is 195805811.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 118508591 - 2²² = 114314287 is a prime.

It is a super-2 number, since 2×118508591² = 28088572281610562, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118508501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59254295 + 59254296.

It is an arithmetic number, because the mean of its divisors is an integer number (59254296).

Almost surely, 2^118508591 is an apocalyptic number.

118508591 is a deficient number, since it is larger than the sum of its proper divisors (1).

118508591 is an equidigital number, since it uses as much as digits as its factorization.

118508591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 38.

The square root of 118508591 is about 10886.1651190858. The cubic root of 118508591 is about 491.1904844517.

The spelling of 118508591 in words is "one hundred eighteen million, five hundred eight thousand, five hundred ninety-one".