12820289 has 2 divisors, whose sum is σ = 12820290. Its totient is φ = 12820288.

The previous prime is 12820259. The next prime is 12820303. The reversal of 12820289 is 98202821.

12820289 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., 12673600 + 146689 = 3560^2 + 383^2 .

It is an emirp because it is prime and its reverse (98202821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12820289 - 2⁸ = 12820033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12820219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410144 + 6410145.

It is an arithmetic number, because the mean of its divisors is an integer number (6410145).

Almost surely, 2^12820289 is an apocalyptic number.

It is an amenable number.

12820289 is a deficient number, since it is larger than the sum of its proper divisors (1).

12820289 is an equidigital number, since it uses as much as digits as its factorization.

12820289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 12820289 is about 3580.5431152271. The cubic root of 12820289 is about 234.0449483869.

The spelling of 12820289 in words is "twelve million, eight hundred twenty thousand, two hundred eighty-nine".