12785209 has 2 divisors, whose sum is σ = 12785210. Its totient is φ = 12785208.

The previous prime is 12785203. The next prime is 12785221. The reversal of 12785209 is 90258721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7856809 + 4928400 = 2803^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 12785209 - 2¹¹ = 12783161 is a prime.

It is not a weakly prime, because it can be changed into another prime (12785203) 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, 6392604 + 6392605.

It is an arithmetic number, because the mean of its divisors is an integer number (6392605).

Almost surely, 2^12785209 is an apocalyptic number.

It is an amenable number.

12785209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12785209 is an equidigital number, since it uses as much as digits as its factorization.

12785209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 12785209 is about 3575.6410614042. The cubic root of 12785209 is about 233.8312819406.

The spelling of 12785209 in words is "twelve million, seven hundred eighty-five thousand, two hundred nine".