12545209 has 2 divisors, whose sum is σ = 12545210. Its totient is φ = 12545208.

The previous prime is 12545179. The next prime is 12545219. The reversal of 12545209 is 90254521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7139584 + 5405625 = 2672^2 + 2325^2 .

It is a cyclic number.

It is not a de Polignac number, because 12545209 - 2⁵ = 12545177 is a prime.

It is not a weakly prime, because it can be changed into another prime (12545219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6272604 + 6272605.

It is an arithmetic number, because the mean of its divisors is an integer number (6272605).

Almost surely, 2^12545209 is an apocalyptic number.

It is an amenable number.

12545209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12545209 is an equidigital number, since it uses as much as digits as its factorization.

12545209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 12545209 is about 3541.9216535660. The cubic root of 12545209 is about 232.3588938370.

The spelling of 12545209 in words is "twelve million, five hundred forty-five thousand, two hundred nine".