118999991 has 24 divisors (see below), whose sum is σ = 135340800. Its totient is φ = 104504400.

The previous prime is 118999967. The next prime is 119000003. The reversal of 118999991 is 199999811.

It is not a de Polignac number, because 118999991 - 2⁶ = 118999927 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 (118999901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 563876 + ... + 564086.

It is an arithmetic number, because the mean of its divisors is an integer number (5639200).

Almost surely, 2^118999991 is an apocalyptic number.

118999991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

118999991 is a deficient number, since it is larger than the sum of its proper divisors (16340809).

118999991 is a wasteful number, since it uses less digits than its factorization.

118999991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 360 counting only the distinct ones).

The product of its digits is 472392, while the sum is 56.

The square root of 118999991 is about 10908.7117021214. The cubic root of 118999991 is about 491.8684610458.

The spelling of 118999991 in words is "one hundred eighteen million, nine hundred ninety-nine thousand, nine hundred ninety-one".