12111109 has 4 divisors (see below), whose sum is σ = 12281760. Its totient is φ = 11940460.

The previous prime is 12111103. The next prime is 12111139. The reversal of 12111109 is 90111121.

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: 90111121 = 193 ⋅466897.

It is a cyclic number.

It is not a de Polignac number, because 12111109 - 2⁹ = 12110597 is a prime.

It is a super-2 number, since 2×12111109² = 293357922419762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111092 and 12111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85219 + ... + 85360.

It is an arithmetic number, because the mean of its divisors is an integer number (3070440).

Almost surely, 2^12111109 is an apocalyptic number.

It is an amenable number.

12111109 is a deficient number, since it is larger than the sum of its proper divisors (170651).

12111109 is an equidigital number, since it uses as much as digits as its factorization.

12111109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170650.

The product of its (nonzero) digits is 18, while the sum is 16.

The square root of 12111109 is about 3480.1018663252. The cubic root of 12111109 is about 229.6472791405.

The spelling of 12111109 in words is "twelve million, one hundred eleven thousand, one hundred nine".