12951209 has 2 divisors, whose sum is σ = 12951210. Its totient is φ = 12951208.

The previous prime is 12951199. The next prime is 12951227. The reversal of 12951209 is 90215921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 595984 = 3515^2 + 772^2 .

It is a cyclic number.

It is not a de Polignac number, because 12951209 - 2⁴ = 12951193 is a prime.

It is not a weakly prime, because it can be changed into another prime (12951259) 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, 6475604 + 6475605.

It is an arithmetic number, because the mean of its divisors is an integer number (6475605).

Almost surely, 2^12951209 is an apocalyptic number.

It is an amenable number.

12951209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12951209 is an equidigital number, since it uses as much as digits as its factorization.

12951209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 12951209 is about 3598.7788206557. The cubic root of 12951209 is about 234.8389359610.

The spelling of 12951209 in words is "twelve million, nine hundred fifty-one thousand, two hundred nine".