12281209 has 4 divisors (see below), whose sum is σ = 12291840. Its totient is φ = 12270580.

The previous prime is 12281207. The next prime is 12281221. The reversal of 12281209 is 90218221.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12281209 - 2¹ = 12281207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12281207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3337 + ... + 5974.

It is an arithmetic number, because the mean of its divisors is an integer number (3072960).

Almost surely, 2^12281209 is an apocalyptic number.

It is an amenable number.

12281209 is a deficient number, since it is larger than the sum of its proper divisors (10631).

12281209 is an equidigital number, since it uses as much as digits as its factorization.

12281209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10630.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12281209 is about 3504.4555925279. The cubic root of 12281209 is about 230.7174133600.

The spelling of 12281209 in words is "twelve million, two hundred eighty-one thousand, two hundred nine".