128019289 has 2 divisors, whose sum is σ = 128019290. Its totient is φ = 128019288.

The previous prime is 128019257. The next prime is 128019323. The reversal of 128019289 is 982910821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107993664 + 20025625 = 10392^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 128019289 - 2⁵ = 128019257 is a prime.

It is not a weakly prime, because it can be changed into another prime (128019389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64009644 + 64009645.

It is an arithmetic number, because the mean of its divisors is an integer number (64009645).

Almost surely, 2^128019289 is an apocalyptic number.

It is an amenable number.

128019289 is a deficient number, since it is larger than the sum of its proper divisors (1).

128019289 is an equidigital number, since it uses as much as digits as its factorization.

128019289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 128019289 is about 11314.5609282906. The cubic root of 128019289 is about 503.9937339126.

The spelling of 128019289 in words is "one hundred twenty-eight million, nineteen thousand, two hundred eighty-nine".