12821579 has 2 divisors, whose sum is σ = 12821580. Its totient is φ = 12821578.

The previous prime is 12821551. The next prime is 12821581. The reversal of 12821579 is 97512821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12821579 is a prime.

Together with 12821581, 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 (12827579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410789 + 6410790.

It is an arithmetic number, because the mean of its divisors is an integer number (6410790).

Almost surely, 2^12821579 is an apocalyptic number.

12821579 is a deficient number, since it is larger than the sum of its proper divisors (1).

12821579 is an equidigital number, since it uses as much as digits as its factorization.

12821579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 12821579 is about 3580.7232509648. The cubic root of 12821579 is about 234.0527981282.

The spelling of 12821579 in words is "twelve million, eight hundred twenty-one thousand, five hundred seventy-nine".