128269189 has 2 divisors, whose sum is σ = 128269190. Its totient is φ = 128269188.

The previous prime is 128269187. The next prime is 128269201. The reversal of 128269189 is 981962821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76860289 + 51408900 = 8767^2 + 7170^2 .

It is a cyclic number.

It is not a de Polignac number, because 128269189 - 2¹ = 128269187 is a prime.

Together with 128269187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128269181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64134594 + 64134595.

It is an arithmetic number, because the mean of its divisors is an integer number (64134595).

Almost surely, 2^128269189 is an apocalyptic number.

It is an amenable number.

128269189 is a deficient number, since it is larger than the sum of its proper divisors (1).

128269189 is an equidigital number, since it uses as much as digits as its factorization.

128269189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 46.

The square root of 128269189 is about 11325.5988362647. The cubic root of 128269189 is about 504.3214610116.

The spelling of 128269189 in words is "one hundred twenty-eight million, two hundred sixty-nine thousand, one hundred eighty-nine".