18055117 has 4 divisors (see below), whose sum is σ = 18119200. Its totient is φ = 17991036.

The previous prime is 18055099. The next prime is 18055151. The reversal of 18055117 is 71155081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71155081 = 17 ⋅4185593.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18055117 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 (18055217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31617 + ... + 32182.

It is an arithmetic number, because the mean of its divisors is an integer number (4529800).

Almost surely, 2^18055117 is an apocalyptic number.

It is an amenable number.

18055117 is a deficient number, since it is larger than the sum of its proper divisors (64083).

18055117 is an equidigital number, since it uses as much as digits as its factorization.

18055117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64082.

The product of its (nonzero) digits is 1400, while the sum is 28.

The square root of 18055117 is about 4249.1313229883. The cubic root of 18055117 is about 262.3413620476.

The spelling of 18055117 in words is "eighteen million, fifty-five thousand, one hundred seventeen".