128544121 has 2 divisors, whose sum is σ = 128544122. Its totient is φ = 128544120.

The previous prime is 128544083. The next prime is 128544161. The reversal of 128544121 is 121445821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118374400 + 10169721 = 10880^2 + 3189^2 .

It is a cyclic number.

It is not a de Polignac number, because 128544121 - 2⁷ = 128543993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128544121.

It is not a weakly prime, because it can be changed into another prime (128544161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64272060 + 64272061.

It is an arithmetic number, because the mean of its divisors is an integer number (64272061).

Almost surely, 2^128544121 is an apocalyptic number.

It is an amenable number.

128544121 is a deficient number, since it is larger than the sum of its proper divisors (1).

128544121 is an equidigital number, since it uses as much as digits as its factorization.

128544121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 28.

The square root of 128544121 is about 11337.7299756168. The cubic root of 128544121 is about 504.6815245185.

Adding to 128544121 its reverse (121445821), we get a palindrome (249989942).

The spelling of 128544121 in words is "one hundred twenty-eight million, five hundred forty-four thousand, one hundred twenty-one".