18201109 has 8 divisors (see below), whose sum is σ = 18472608. Its totient is φ = 17931600.

The previous prime is 18201103. The next prime is 18201121. The reversal of 18201109 is 90110281.

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 18201109 - 2¹³ = 18192917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18201109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18201103) 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, 30714 + ... + 31300.

It is an arithmetic number, because the mean of its divisors is an integer number (2309076).

Almost surely, 2^18201109 is an apocalyptic number.

It is an amenable number.

18201109 is a deficient number, since it is larger than the sum of its proper divisors (271499).

18201109 is a wasteful number, since it uses less digits than its factorization.

18201109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 18201109 is about 4266.2757763651. The cubic root of 18201109 is about 263.0465540436.

The spelling of 18201109 in words is "eighteen million, two hundred one thousand, one hundred nine".