12685609 has 2 divisors, whose sum is σ = 12685610. Its totient is φ = 12685608.

The previous prime is 12685591. The next prime is 12685619. The reversal of 12685609 is 90658621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7139584 + 5546025 = 2672^2 + 2355^2 .

It is a cyclic number.

It is not a de Polignac number, because 12685609 - 2⁷ = 12685481 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12685619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6342804 + 6342805.

It is an arithmetic number, because the mean of its divisors is an integer number (6342805).

Almost surely, 2^12685609 is an apocalyptic number.

It is an amenable number.

12685609 is a deficient number, since it is larger than the sum of its proper divisors (1).

12685609 is an equidigital number, since it uses as much as digits as its factorization.

12685609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 12685609 is about 3561.6862579402. The cubic root of 12685609 is about 233.2224967926. Note that the first 3 decimals are identical.

The spelling of 12685609 in words is "twelve million, six hundred eighty-five thousand, six hundred nine".