18518133 has 4 divisors (see below), whose sum is σ = 24690848. Its totient is φ = 12345420.

The previous prime is 18518113. The next prime is 18518161. The reversal of 18518133 is 33181581.

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 not a de Polignac number, because 18518133 - 2⁶ = 18518069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18518133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18518113) 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 3 ways as a sum of consecutive naturals, for example, 3086353 + ... + 3086358.

It is an arithmetic number, because the mean of its divisors is an integer number (6172712).

Almost surely, 2^18518133 is an apocalyptic number.

It is an amenable number.

18518133 is a deficient number, since it is larger than the sum of its proper divisors (6172715).

18518133 is an equidigital number, since it uses as much as digits as its factorization.

18518133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6172714.

The product of its digits is 2880, while the sum is 30.

The square root of 18518133 is about 4303.2700356822. The cubic root of 18518133 is about 264.5650060645.

The spelling of 18518133 in words is "eighteen million, five hundred eighteen thousand, one hundred thirty-three".