12351209 has 8 divisors (see below), whose sum is σ = 13626312. Its totient is φ = 11122560.

The previous prime is 12351203. The next prime is 12351217. The reversal of 12351209 is 90215321.

12351209 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2111209 + 10240000 = 1453^2 + 3200^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12351209 - 2⁴ = 12351193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12351203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11054 + ... + 12119.

It is an arithmetic number, because the mean of its divisors is an integer number (1703289).

Almost surely, 2^12351209 is an apocalyptic number.

It is an amenable number.

12351209 is a deficient number, since it is larger than the sum of its proper divisors (1275103).

12351209 is a wasteful number, since it uses less digits than its factorization.

12351209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23227.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 12351209 is about 3514.4286875679. The cubic root of 12351209 is about 231.1549281460.

The spelling of 12351209 in words is "twelve million, three hundred fifty-one thousand, two hundred nine".