12091109 has 2 divisors, whose sum is σ = 12091110. Its totient is φ = 12091108.

The previous prime is 12091103. The next prime is 12091111. The reversal of 12091109 is 90119021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6225025 + 5866084 = 2495^2 + 2422^2 .

It is a cyclic number.

It is not a de Polignac number, because 12091109 - 2⁸ = 12090853 is a prime.

Together with 12091111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12091103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6045554 + 6045555.

It is an arithmetic number, because the mean of its divisors is an integer number (6045555).

Almost surely, 2^12091109 is an apocalyptic number.

It is an amenable number.

12091109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12091109 is an equidigital number, since it uses as much as digits as its factorization.

12091109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 12091109 is about 3477.2271999396. The cubic root of 12091109 is about 229.5207981240.

The spelling of 12091109 in words is "twelve million, ninety-one thousand, one hundred nine".