12729109 has 2 divisors, whose sum is σ = 12729110. Its totient is φ = 12729108.

The previous prime is 12729091. The next prime is 12729113. The reversal of 12729109 is 90192721.

Together with previous prime (12729091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7452900 + 5276209 = 2730^2 + 2297^2 .

It is an emirp because it is prime and its reverse (90192721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12729109 - 2¹¹ = 12727061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12729179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6364554 + 6364555.

It is an arithmetic number, because the mean of its divisors is an integer number (6364555).

Almost surely, 2^12729109 is an apocalyptic number.

It is an amenable number.

12729109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12729109 is an equidigital number, since it uses as much as digits as its factorization.

12729109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 12729109 is about 3567.7876898717. The cubic root of 12729109 is about 233.4887723923.

The spelling of 12729109 in words is "twelve million, seven hundred twenty-nine thousand, one hundred nine".