12939207209 has 2 divisors, whose sum is σ = 12939207210. Its totient is φ = 12939207208.

The previous prime is 12939207199. The next prime is 12939207217. The reversal of 12939207209 is 90270293921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12882250000 + 56957209 = 113500^2 + 7547^2 .

It is a cyclic number.

It is not a de Polignac number, because 12939207209 - 2¹² = 12939203113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12939207209.

It is not a weakly prime, because it can be changed into another prime (12939207289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6469603604 + 6469603605.

It is an arithmetic number, because the mean of its divisors is an integer number (6469603605).

Almost surely, 2^12939207209 is an apocalyptic number.

It is an amenable number.

12939207209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12939207209 is an equidigital number, since it uses as much as digits as its factorization.

12939207209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 12939207209 in words is "twelve billion, nine hundred thirty-nine million, two hundred seven thousand, two hundred nine".