12563591 has 2 divisors, whose sum is σ = 12563592. Its totient is φ = 12563590.

The previous prime is 12563581. The next prime is 12563669. The reversal of 12563591 is 19536521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12563591 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12563501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6281795 + 6281796.

It is an arithmetic number, because the mean of its divisors is an integer number (6281796).

Almost surely, 2^12563591 is an apocalyptic number.

12563591 is a deficient number, since it is larger than the sum of its proper divisors (1).

12563591 is an equidigital number, since it uses as much as digits as its factorization.

12563591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 32.

The square root of 12563591 is about 3544.5156227615. The cubic root of 12563591 is about 232.4723272263.

The spelling of 12563591 in words is "twelve million, five hundred sixty-three thousand, five hundred ninety-one".