118831209 has 16 divisors (see below), whose sum is σ = 183628800. Its totient is φ = 66946320.

The previous prime is 118831171. The next prime is 118831211. The reversal of 118831209 is 902138811.

It is not a de Polignac number, because 118831209 - 2¹⁵ = 118798441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 118831209.

It is not an unprimeable number, because it can be changed into a prime (118831709) 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 15 ways as a sum of consecutive naturals, for example, 38359 + ... + 41340.

It is an arithmetic number, because the mean of its divisors is an integer number (11476800).

Almost surely, 2^118831209 is an apocalyptic number.

It is an amenable number.

118831209 is a deficient number, since it is larger than the sum of its proper divisors (64797591).

118831209 is an equidigital number, since it uses as much as digits as its factorization.

118831209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79780.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 118831209 is about 10900.9728464940. The cubic root of 118831209 is about 491.6358060620.

The spelling of 118831209 in words is "one hundred eighteen million, eight hundred thirty-one thousand, two hundred nine".