18051009 has 4 divisors (see below), whose sum is σ = 24068016. Its totient is φ = 12034004.

The previous prime is 18051001. The next prime is 18051031. The reversal of 18051009 is 90015081.

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 18051009 - 2³ = 18051001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18051009.

It is not an unprimeable number, because it can be changed into a prime (18051001) 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, 3008499 + ... + 3008504.

It is an arithmetic number, because the mean of its divisors is an integer number (6017004).

Almost surely, 2^18051009 is an apocalyptic number.

It is an amenable number.

18051009 is a deficient number, since it is larger than the sum of its proper divisors (6017007).

18051009 is an equidigital number, since it uses as much as digits as its factorization.

18051009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6017006.

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 18051009 is about 4248.6479025685. The cubic root of 18051009 is about 262.3214640862.

The spelling of 18051009 in words is "eighteen million, fifty-one thousand, nine".