18135109 has 8 divisors (see below), whose sum is σ = 19103040. Its totient is φ = 17182176.

The previous prime is 18135097. The next prime is 18135113. The reversal of 18135109 is 90153181.

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 18135109 - 2⁵ = 18135077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18135119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1224 + ... + 6145.

It is an arithmetic number, because the mean of its divisors is an integer number (2387880).

Almost surely, 2^18135109 is an apocalyptic number.

It is an amenable number.

18135109 is a deficient number, since it is larger than the sum of its proper divisors (967931).

18135109 is a wasteful number, since it uses less digits than its factorization.

18135109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7499.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 18135109 is about 4258.5336678251. The cubic root of 18135109 is about 262.7282199688.

The spelling of 18135109 in words is "eighteen million, one hundred thirty-five thousand, one hundred nine".