12729013009 has 2 divisors, whose sum is σ = 12729013010. Its totient is φ = 12729013008.

The previous prime is 12729013001. The next prime is 12729013039. The reversal of 12729013009 is 90031092721.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10977171984 + 1751841025 = 104772^2 + 41855^2 .

It is an emirp because it is prime and its reverse (90031092721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12729013009 - 2³ = 12729013001 is a prime.

It is not a weakly prime, because it can be changed into another prime (12729013001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6364506504 + 6364506505.

It is an arithmetic number, because the mean of its divisors is an integer number (6364506505).

Almost surely, 2^12729013009 is an apocalyptic number.

It is an amenable number.

12729013009 is a deficient number, since it is larger than the sum of its proper divisors (1).

12729013009 is an equidigital number, since it uses as much as digits as its factorization.

12729013009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The spelling of 12729013009 in words is "twelve billion, seven hundred twenty-nine million, thirteen thousand, nine".