12806557 has 2 divisors, whose sum is σ = 12806558. Its totient is φ = 12806556.

The previous prime is 12806533. The next prime is 12806587. The reversal of 12806557 is 75560821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12068676 + 737881 = 3474^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 12806557 - 2¹¹ = 12804509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12806527) 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, 6403278 + 6403279.

It is an arithmetic number, because the mean of its divisors is an integer number (6403279).

Almost surely, 2^12806557 is an apocalyptic number.

It is an amenable number.

12806557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12806557 is an equidigital number, since it uses as much as digits as its factorization.

12806557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 12806557 is about 3578.6250152817. The cubic root of 12806557 is about 233.9613555391.

The spelling of 12806557 in words is "twelve million, eight hundred six thousand, five hundred fifty-seven".