12856549 has 2 divisors, whose sum is σ = 12856550. Its totient is φ = 12856548.

The previous prime is 12856523. The next prime is 12856553. The reversal of 12856549 is 94565821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10660225 + 2196324 = 3265^2 + 1482^2 .

It is a cyclic number.

It is not a de Polignac number, because 12856549 - 2⁹ = 12856037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12856579) 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, 6428274 + 6428275.

It is an arithmetic number, because the mean of its divisors is an integer number (6428275).

Almost surely, 2^12856549 is an apocalyptic number.

It is an amenable number.

12856549 is a deficient number, since it is larger than the sum of its proper divisors (1).

12856549 is an equidigital number, since it uses as much as digits as its factorization.

12856549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 40.

The square root of 12856549 is about 3585.6030176248. The cubic root of 12856549 is about 234.2653927553.

The spelling of 12856549 in words is "twelve million, eight hundred fifty-six thousand, five hundred forty-nine".