12817591 has 2 divisors, whose sum is σ = 12817592. Its totient is φ = 12817590.

The previous prime is 12817589. The next prime is 12817619. The reversal of 12817591 is 19571821.

It is a happy number.

12817591 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (19571821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12817591 - 2¹ = 12817589 is a prime.

Together with 12817589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12817531) 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, 6408795 + 6408796.

It is an arithmetic number, because the mean of its divisors is an integer number (6408796).

Almost surely, 2^12817591 is an apocalyptic number.

12817591 is a deficient number, since it is larger than the sum of its proper divisors (1).

12817591 is an equidigital number, since it uses as much as digits as its factorization.

12817591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 34.

The square root of 12817591 is about 3580.1663369179. The cubic root of 12817591 is about 234.0285291634.

The spelling of 12817591 in words is "twelve million, eight hundred seventeen thousand, five hundred ninety-one".