18188113 has 8 divisors (see below), whose sum is σ = 19306080. Its totient is φ = 17075520.

The previous prime is 18188087. The next prime is 18188123. The reversal of 18188113 is 31188181.

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

It is a cyclic number.

It is not a de Polignac number, because 18188113 - 2¹³ = 18179921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18188123) 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, 7258 + ... + 9436.

It is an arithmetic number, because the mean of its divisors is an integer number (2413260).

Almost surely, 2^18188113 is an apocalyptic number.

It is an amenable number.

18188113 is a deficient number, since it is larger than the sum of its proper divisors (1117967).

18188113 is a wasteful number, since it uses less digits than its factorization.

18188113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687.

The product of its digits is 1536, while the sum is 31.

The square root of 18188113 is about 4264.7523960952. The cubic root of 18188113 is about 262.9839320905.

The spelling of 18188113 in words is "eighteen million, one hundred eighty-eight thousand, one hundred thirteen".