128189 has 2 divisors, whose sum is σ = 128190. Its totient is φ = 128188.

The previous prime is 128173. The next prime is 128201. The reversal of 128189 is 981821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128164 + 25 = 358^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 128189 - 2⁴ = 128173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128119) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64094 + 64095.

It is an arithmetic number, because the mean of its divisors is an integer number (64095).

2¹²⁸¹⁸⁹ is an apocalyptic number.

It is an amenable number.

128189 is a deficient number, since it is larger than the sum of its proper divisors (1).

128189 is an equidigital number, since it uses as much as digits as its factorization.

128189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 29.

The square root of 128189 is about 358.0349144986. The cubic root of 128189 is about 50.4216344929.

The spelling of 128189 in words is "one hundred twenty-eight thousand, one hundred eighty-nine".