128018489 has 2 divisors, whose sum is σ = 128018490. Its totient is φ = 128018488.

The previous prime is 128018419. The next prime is 128018497. The reversal of 128018489 is 984810821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105740089 + 22278400 = 10283^2 + 4720^2 .

It is a cyclic number.

It is not a de Polignac number, because 128018489 - 2¹⁶ = 127952953 is a prime.

It is not a weakly prime, because it can be changed into another prime (128018419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64009244 + 64009245.

It is an arithmetic number, because the mean of its divisors is an integer number (64009245).

Almost surely, 2^128018489 is an apocalyptic number.

It is an amenable number.

128018489 is a deficient number, since it is larger than the sum of its proper divisors (1).

128018489 is an equidigital number, since it uses as much as digits as its factorization.

128018489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 41.

The square root of 128018489 is about 11314.5255755599. The cubic root of 128018489 is about 503.9926840817.

The spelling of 128018489 in words is "one hundred twenty-eight million, eighteen thousand, four hundred eighty-nine".