18557117 has 4 divisors (see below), whose sum is σ = 18730656. Its totient is φ = 18383580.

The previous prime is 18557101. The next prime is 18557131. The reversal of 18557117 is 71175581.

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.

It is a cyclic number.

It is not a de Polignac number, because 18557117 - 2⁴ = 18557101 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 (18557137) 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 3 ways as a sum of consecutive naturals, for example, 86609 + ... + 86822.

It is an arithmetic number, because the mean of its divisors is an integer number (4682664).

Almost surely, 2^18557117 is an apocalyptic number.

It is an amenable number.

18557117 is a deficient number, since it is larger than the sum of its proper divisors (173539).

18557117 is a wasteful number, since it uses less digits than its factorization.

18557117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173538.

The product of its digits is 9800, while the sum is 35.

The square root of 18557117 is about 4307.7972329254. The cubic root of 18557117 is about 264.7505282439.

The spelling of 18557117 in words is "eighteen million, five hundred fifty-seven thousand, one hundred seventeen".