18045149 has 4 divisors (see below), whose sum is σ = 18072636. Its totient is φ = 18017664.

The previous prime is 18045067. The next prime is 18045173. The reversal of 18045149 is 94154081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9721924 + 8323225 = 3118^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 18045149 - 2⁸ = 18044893 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18045199) 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, 12734 + ... + 14079.

It is an arithmetic number, because the mean of its divisors is an integer number (4518159).

Almost surely, 2^18045149 is an apocalyptic number.

It is an amenable number.

18045149 is a deficient number, since it is larger than the sum of its proper divisors (27487).

18045149 is an equidigital number, since it uses as much as digits as its factorization.

18045149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27486.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 18045149 is about 4247.9582154254. The cubic root of 18045149 is about 262.2930747193.

The spelling of 18045149 in words is "eighteen million, forty-five thousand, one hundred forty-nine".