12125209 has 6 divisors (see below), whose sum is σ = 12675866. Its totient is φ = 11597520.

The previous prime is 12125207. The next prime is 12125231. The reversal of 12125209 is 90252121.

It can be written as a sum of positive squares in only one way, i.e., 10220809 + 1904400 = 3197^2 + 1380^2 .

It is not a de Polignac number, because 12125209 - 2¹ = 12125207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12125209.

It is not an unprimeable number, because it can be changed into a prime (12125207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10932 + ... + 11989.

Almost surely, 2^12125209 is an apocalyptic number.

It is an amenable number.

12125209 is a deficient number, since it is larger than the sum of its proper divisors (550657).

12125209 is an equidigital number, since it uses as much as digits as its factorization.

12125209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22967 (or 22944 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 12125209 is about 3482.1270798177. The cubic root of 12125209 is about 229.7363645924.

The spelling of 12125209 in words is "twelve million, one hundred twenty-five thousand, two hundred nine".