12805691 has 2 divisors, whose sum is σ = 12805692. Its totient is φ = 12805690.

The previous prime is 12805679. The next prime is 12805693. The reversal of 12805691 is 19650821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12805691 - 2⁶ = 12805627 is a prime.

Together with 12805693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12805693) 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, 6402845 + 6402846.

It is an arithmetic number, because the mean of its divisors is an integer number (6402846).

Almost surely, 2^12805691 is an apocalyptic number.

12805691 is a deficient number, since it is larger than the sum of its proper divisors (1).

12805691 is an equidigital number, since it uses as much as digits as its factorization.

12805691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 12805691 is about 3578.5040170440. The cubic root of 12805691 is about 233.9560818057.

The spelling of 12805691 in words is "twelve million, eight hundred five thousand, six hundred ninety-one".