12281909 has 2 divisors, whose sum is σ = 12281910. Its totient is φ = 12281908.

The previous prime is 12281881. The next prime is 12281947. The reversal of 12281909 is 90918221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12229009 + 52900 = 3497^2 + 230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12281909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12289909) 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, 6140954 + 6140955.

It is an arithmetic number, because the mean of its divisors is an integer number (6140955).

Almost surely, 2^12281909 is an apocalyptic number.

It is an amenable number.

12281909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12281909 is an equidigital number, since it uses as much as digits as its factorization.

12281909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12281909 is about 3504.5554639640. Note that the first 3 decimals coincide. The cubic root of 12281909 is about 230.7217967265.

The spelling of 12281909 in words is "twelve million, two hundred eighty-one thousand, nine hundred nine".