118118491 has 2 divisors, whose sum is σ = 118118492. Its totient is φ = 118118490.

The previous prime is 118118489. The next prime is 118118551. The reversal of 118118491 is 194811811.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (194811811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118118491 - 2¹ = 118118489 is a prime.

It is a super-2 number, since 2×118118491² = 27903955832234162, which contains 22 as substring.

Together with 118118489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (118118461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59059245 + 59059246.

It is an arithmetic number, because the mean of its divisors is an integer number (59059246).

Almost surely, 2^118118491 is an apocalyptic number.

118118491 is a deficient number, since it is larger than the sum of its proper divisors (1).

118118491 is an equidigital number, since it uses as much as digits as its factorization.

118118491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 34.

The square root of 118118491 is about 10868.2331130686. The cubic root of 118118491 is about 490.6509341424.

It can be divided in two parts, 11811 and 8491, that added together give a palindrome (20302).

The spelling of 118118491 in words is "one hundred eighteen million, one hundred eighteen thousand, four hundred ninety-one".