18111136 has 12 divisors (see below), whose sum is σ = 35656362. Its totient is φ = 9055552.

The previous prime is 18111131. The next prime is 18111139. The reversal of 18111136 is 63111181.

It can be written as a sum of positive squares in only one way, i.e., 11861136 + 6250000 = 3444^2 + 2500^2 .

It is not an unprimeable number, because it can be changed into a prime (18111131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282955 + ... + 283018.

Almost surely, 2^18111136 is an apocalyptic number.

18111136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18111136 is a deficient number, since it is larger than the sum of its proper divisors (17545226).

18111136 is an equidigital number, since it uses as much as digits as its factorization.

18111136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565983 (or 565975 counting only the distinct ones).

The product of its digits is 144, while the sum is 22.

The square root of 18111136 is about 4255.7180357726. The cubic root of 18111136 is about 262.6124011455.

The spelling of 18111136 in words is "eighteen million, one hundred eleven thousand, one hundred thirty-six".