18118851 has 8 divisors (see below), whose sum is σ = 24180240. Its totient is φ = 12068352.

The previous prime is 18118831. The next prime is 18118861. The reversal of 18118851 is 15881181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-18118851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18118801) 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 7 ways as a sum of consecutive naturals, for example, 2715 + ... + 6603.

It is an arithmetic number, because the mean of its divisors is an integer number (3022530).

Almost surely, 2^18118851 is an apocalyptic number.

18118851 is a deficient number, since it is larger than the sum of its proper divisors (6061389).

18118851 is a wasteful number, since it uses less digits than its factorization.

18118851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5445.

The product of its digits is 2560, while the sum is 33.

The square root of 18118851 is about 4256.6243667958. The cubic root of 18118851 is about 262.6496851505.

Subtracting from 18118851 its reverse (15881181), we obtain a triangular number (2237670 = T₂₁₁₅).

The spelling of 18118851 in words is "eighteen million, one hundred eighteen thousand, eight hundred fifty-one".