18841109 has 4 divisors (see below), whose sum is σ = 21532704. Its totient is φ = 16149516.

The previous prime is 18841093. The next prime is 18841127. The reversal of 18841109 is 90114881.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90114881 = 2917 ⋅30893.

It is a cyclic number.

It is not a de Polignac number, because 18841109 - 2⁴ = 18841093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18841189) 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, 1345787 + ... + 1345800.

It is an arithmetic number, because the mean of its divisors is an integer number (5383176).

Almost surely, 2^18841109 is an apocalyptic number.

It is an amenable number.

18841109 is a deficient number, since it is larger than the sum of its proper divisors (2691595).

18841109 is an equidigital number, since it uses as much as digits as its factorization.

18841109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691594.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 18841109 is about 4340.6346310188. The cubic root of 18841109 is about 266.0942483593.

The spelling of 18841109 in words is "eighteen million, eight hundred forty-one thousand, one hundred nine".