12506000209 has 2 divisors, whose sum is σ = 12506000210. Its totient is φ = 12506000208.

The previous prime is 12506000179. The next prime is 12506000237. The reversal of 12506000209 is 90200060521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12253825809 + 252174400 = 110697^2 + 15880^2 .

It is a cyclic number.

It is not a de Polignac number, because 12506000209 - 2¹³ = 12505992017 is a prime.

It is not a weakly prime, because it can be changed into another prime (12506000239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6253000104 + 6253000105.

It is an arithmetic number, because the mean of its divisors is an integer number (6253000105).

Almost surely, 2^12506000209 is an apocalyptic number.

It is an amenable number.

12506000209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12506000209 is an equidigital number, since it uses as much as digits as its factorization.

12506000209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The spelling of 12506000209 in words is "twelve billion, five hundred six million, two hundred nine", and thus it is an aban number.