12929209 has 2 divisors, whose sum is σ = 12929210. Its totient is φ = 12929208.

The previous prime is 12929207. The next prime is 12929221. The reversal of 12929209 is 90292921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12924025 + 5184 = 3595^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 12929209 - 2¹ = 12929207 is a prime.

Together with 12929207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12929207) 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, 6464604 + 6464605.

It is an arithmetic number, because the mean of its divisors is an integer number (6464605).

Almost surely, 2^12929209 is an apocalyptic number.

It is an amenable number.

12929209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12929209 is an equidigital number, since it uses as much as digits as its factorization.

12929209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 12929209 is about 3595.7209291045. The cubic root of 12929209 is about 234.7058882858.

It can be divided in two parts, 1292 and 9209, that added together give a palindrome (10501).

The spelling of 12929209 in words is "twelve million, nine hundred twenty-nine thousand, two hundred nine".