18109045 has 8 divisors (see below), whose sum is σ = 21809880. Its totient is φ = 14434560.

The previous prime is 18109019. The next prime is 18109051. The reversal of 18109045 is 54090181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4024036 + 14085009 = 2006^2 + 3753^2 .

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

It is not a de Polignac number, because 18109045 - 2¹¹ = 18106997 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 5040 + ... + 7849.

It is an arithmetic number, because the mean of its divisors is an integer number (2726235).

Almost surely, 2^18109045 is an apocalyptic number.

It is an amenable number.

18109045 is a deficient number, since it is larger than the sum of its proper divisors (3700835).

18109045 is a wasteful number, since it uses less digits than its factorization.

18109045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13175.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18109045 is about 4255.4723592100. The cubic root of 18109045 is about 262.6022942207.

The spelling of 18109045 in words is "eighteen million, one hundred nine thousand, forty-five".