12799909 has 2 divisors, whose sum is σ = 12799910. Its totient is φ = 12799908.

The previous prime is 12799907. The next prime is 12799921. The reversal of 12799909 is 90999721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6812100 + 5987809 = 2610^2 + 2447^2 .

It is a cyclic number.

It is not a de Polignac number, because 12799909 - 2¹ = 12799907 is a prime.

Together with 12799907, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12799907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6399954 + 6399955.

It is an arithmetic number, because the mean of its divisors is an integer number (6399955).

Almost surely, 2^12799909 is an apocalyptic number.

It is an amenable number.

12799909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12799909 is an equidigital number, since it uses as much as digits as its factorization.

12799909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 12799909 is about 3577.6960463404. The cubic root of 12799909 is about 233.9208647107.

The spelling of 12799909 in words is "twelve million, seven hundred ninety-nine thousand, nine hundred nine".