128959489 has 2 divisors, whose sum is σ = 128959490. Its totient is φ = 128959488.

The previous prime is 128959477. The next prime is 128959511. The reversal of 128959489 is 984959821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112190464 + 16769025 = 10592^2 + 4095^2 .

It is a cyclic number.

It is not a de Polignac number, because 128959489 - 2⁷ = 128959361 is a prime.

It is a super-2 number, since 2×128959489² = 33261099606282242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128959409) 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, 64479744 + 64479745.

It is an arithmetic number, because the mean of its divisors is an integer number (64479745).

Almost surely, 2^128959489 is an apocalyptic number.

It is an amenable number.

128959489 is a deficient number, since it is larger than the sum of its proper divisors (1).

128959489 is an equidigital number, since it uses as much as digits as its factorization.

128959489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 55.

The square root of 128959489 is about 11356.0331542313. The cubic root of 128959489 is about 505.2245369502.

The spelling of 128959489 in words is "one hundred twenty-eight million, nine hundred fifty-nine thousand, four hundred eighty-nine".