12018109 has 4 divisors (see below), whose sum is σ = 12037500. Its totient is φ = 11998720.

The previous prime is 12018107. The next prime is 12018163. The reversal of 12018109 is 90181021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9474084 + 2544025 = 3078^2 + 1595^2 .

It is a cyclic number.

It is not a de Polignac number, because 12018109 - 2¹ = 12018107 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 12018109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12018101) 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, 8734 + ... + 10015.

It is an arithmetic number, because the mean of its divisors is an integer number (3009375).

Almost surely, 2^12018109 is an apocalyptic number.

It is an amenable number.

12018109 is a deficient number, since it is larger than the sum of its proper divisors (19391).

12018109 is an equidigital number, since it uses as much as digits as its factorization.

12018109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19390.

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

The square root of 12018109 is about 3466.7144387734. The cubic root of 12018109 is about 229.0579552405.

The spelling of 12018109 in words is "twelve million, eighteen thousand, one hundred nine".