12891449 has 2 divisors, whose sum is σ = 12891450. Its totient is φ = 12891448.

The previous prime is 12891433. The next prime is 12891451. The reversal of 12891449 is 94419821.

12891449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9765625 + 3125824 = 3125^2 + 1768^2 .

It is an emirp because it is prime and its reverse (94419821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12891449 - 2⁴ = 12891433 is a prime.

Together with 12891451, 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 (12891409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6445724 + 6445725.

It is an arithmetic number, because the mean of its divisors is an integer number (6445725).

Almost surely, 2^12891449 is an apocalyptic number.

It is an amenable number.

12891449 is a deficient number, since it is larger than the sum of its proper divisors (1).

12891449 is an equidigital number, since it uses as much as digits as its factorization.

12891449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 12891449 is about 3590.4664042433. The cubic root of 12891449 is about 234.4771778245.

The spelling of 12891449 in words is "twelve million, eight hundred ninety-one thousand, four hundred forty-nine".