128162189 has 2 divisors, whose sum is σ = 128162190. Its totient is φ = 128162188.

The previous prime is 128162161. The next prime is 128162249. The reversal of 128162189 is 981261821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120780100 + 7382089 = 10990^2 + 2717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128162189 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 (128162689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64081094 + 64081095.

It is an arithmetic number, because the mean of its divisors is an integer number (64081095).

Almost surely, 2^128162189 is an apocalyptic number.

It is an amenable number.

128162189 is a deficient number, since it is larger than the sum of its proper divisors (1).

128162189 is an equidigital number, since it uses as much as digits as its factorization.

128162189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 38.

The square root of 128162189 is about 11320.8740386951. The cubic root of 128162189 is about 504.1811898403.

The spelling of 128162189 in words is "one hundred twenty-eight million, one hundred sixty-two thousand, one hundred eighty-nine".