18141109 has 4 divisors (see below), whose sum is σ = 20732704. Its totient is φ = 15549516.

The previous prime is 18141103. The next prime is 18141119. The reversal of 18141109 is 90114181.

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 18141109 - 2⁵ = 18141077 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 (18141103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1295787 + ... + 1295800.

It is an arithmetic number, because the mean of its divisors is an integer number (5183176).

Almost surely, 2^18141109 is an apocalyptic number.

It is an amenable number.

18141109 is a deficient number, since it is larger than the sum of its proper divisors (2591595).

18141109 is an equidigital number, since it uses as much as digits as its factorization.

18141109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591594.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 18141109 is about 4259.2380774030. The cubic root of 18141109 is about 262.7571913140.

The spelling of 18141109 in words is "eighteen million, one hundred forty-one thousand, one hundred nine".