18811089 has 16 divisors (see below), whose sum is σ = 30402240. Its totient is φ = 11400480.

The previous prime is 18811073. The next prime is 18811099. The reversal of 18811089 is 98011881.

It is not a de Polignac number, because 18811089 - 2⁴ = 18811073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18811049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31372 + ... + 31965.

It is an arithmetic number, because the mean of its divisors is an integer number (1900140).

Almost surely, 2^18811089 is an apocalyptic number.

It is an amenable number.

18811089 is a deficient number, since it is larger than the sum of its proper divisors (11591151).

18811089 is a wasteful number, since it uses less digits than its factorization.

18811089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63357 (or 63351 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The square root of 18811089 is about 4337.1752327984. The cubic root of 18811089 is about 265.9528484083.

The spelling of 18811089 in words is "eighteen million, eight hundred eleven thousand, eighty-nine".