12182809 has 2 divisors, whose sum is σ = 12182810. Its totient is φ = 12182808.

The previous prime is 12182777. The next prime is 12182837. The reversal of 12182809 is 90828121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10368400 + 1814409 = 3220^2 + 1347^2 .

It is an emirp because it is prime and its reverse (90828121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12182809 - 2⁵ = 12182777 is a prime.

It is not a weakly prime, because it can be changed into another prime (12182839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6091404 + 6091405.

It is an arithmetic number, because the mean of its divisors is an integer number (6091405).

Almost surely, 2^12182809 is an apocalyptic number.

It is an amenable number.

12182809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12182809 is an equidigital number, since it uses as much as digits as its factorization.

12182809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 12182809 is about 3490.3880873049. The cubic root of 12182809 is about 230.0995725134.

The spelling of 12182809 in words is "twelve million, one hundred eighty-two thousand, eight hundred nine".