118305891 has 24 divisors (see below), whose sum is σ = 186810624. Its totient is φ = 71550960.

The previous prime is 118305881. The next prime is 118305893. The reversal of 118305891 is 198503811.

It is not a de Polignac number, because 118305891 - 2¹⁰ = 118304867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (118305893) 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 in 23 ways as a sum of consecutive naturals, for example, 63130 + ... + 64976.

It is an arithmetic number, because the mean of its divisors is an integer number (7783776).

Almost surely, 2^118305891 is an apocalyptic number.

118305891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

118305891 is a deficient number, since it is larger than the sum of its proper divisors (68504733).

118305891 is a wasteful number, since it uses less digits than its factorization.

118305891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511 (or 2508 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 36.

The square root of 118305891 is about 10876.8511527923. The cubic root of 118305891 is about 490.9102765497.

The spelling of 118305891 in words is "one hundred eighteen million, three hundred five thousand, eight hundred ninety-one".