12565871 has 2 divisors, whose sum is σ = 12565872. Its totient is φ = 12565870.

The previous prime is 12565853. The next prime is 12565919. The reversal of 12565871 is 17856521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12565871 - 2¹⁰ = 12564847 is a prime.

It is a super-2 number, since 2×12565871² = 315802227977282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12565801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6282935 + 6282936.

It is an arithmetic number, because the mean of its divisors is an integer number (6282936).

Almost surely, 2^12565871 is an apocalyptic number.

12565871 is a deficient number, since it is larger than the sum of its proper divisors (1).

12565871 is an equidigital number, since it uses as much as digits as its factorization.

12565871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 35.

The square root of 12565871 is about 3544.8372318063. The cubic root of 12565871 is about 232.4863891520.

The spelling of 12565871 in words is "twelve million, five hundred sixty-five thousand, eight hundred seventy-one".