12808661 has 2 divisors, whose sum is σ = 12808662. Its totient is φ = 12808660.

The previous prime is 12808637. The next prime is 12808721. The reversal of 12808661 is 16680821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12208036 + 600625 = 3494^2 + 775^2 .

It is a cyclic number.

It is not a de Polignac number, because 12808661 - 2²² = 8614357 is a prime.

It is a super-2 number, since 2×12808661² = 328123593225842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12801661) 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, 6404330 + 6404331.

It is an arithmetic number, because the mean of its divisors is an integer number (6404331).

Almost surely, 2^12808661 is an apocalyptic number.

It is an amenable number.

12808661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12808661 is an equidigital number, since it uses as much as digits as its factorization.

12808661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 12808661 is about 3578.9189708626. The cubic root of 12808661 is about 233.9741674067.

The spelling of 12808661 in words is "twelve million, eight hundred eight thousand, six hundred sixty-one".