118149791 has 4 divisors (see below), whose sum is σ = 118204800. Its totient is φ = 118094784.

The previous prime is 118149739. The next prime is 118149797. The reversal of 118149791 is 197941811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197941811 = 3313 ⋅59747.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118149791 is a prime.

It is a super-2 number, since 2×118149791² = 27918746226687362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118149797) 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, 24146 + ... + 28623.

It is an arithmetic number, because the mean of its divisors is an integer number (29551200).

Almost surely, 2^118149791 is an apocalyptic number.

118149791 is a deficient number, since it is larger than the sum of its proper divisors (55009).

118149791 is an equidigital number, since it uses as much as digits as its factorization.

118149791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55008.

The product of its digits is 18144, while the sum is 41.

The square root of 118149791 is about 10869.6729941613. The cubic root of 118149791 is about 490.6942692087.

The spelling of 118149791 in words is "one hundred eighteen million, one hundred forty-nine thousand, seven hundred ninety-one".