12109091 has 2 divisors, whose sum is σ = 12109092. Its totient is φ = 12109090.

The previous prime is 12109067. The next prime is 12109103. The reversal of 12109091 is 19090121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12109091 - 2¹⁰ = 12108067 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12109051) 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 as a sum of consecutive naturals, namely, 6054545 + 6054546.

It is an arithmetic number, because the mean of its divisors is an integer number (6054546).

Almost surely, 2^12109091 is an apocalyptic number.

12109091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12109091 is an equidigital number, since it uses as much as digits as its factorization.

12109091 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 12109091 is about 3479.8119202049. The cubic root of 12109091 is about 229.6345235250.

It can be divided in two parts, 1210 and 9091, that added together give a palindrome (10301).

The spelling of 12109091 in words is "twelve million, one hundred nine thousand, ninety-one".