128530169 has 2 divisors, whose sum is σ = 128530170. Its totient is φ = 128530168.

The previous prime is 128530163. The next prime is 128530211. The reversal of 128530169 is 961035821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64722025 + 63808144 = 8045^2 + 7988^2 .

It is an emirp because it is prime and its reverse (961035821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128530169 - 2⁴ = 128530153 is a prime.

It is a super-2 number, since 2×128530169² = 33040008686337122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128530163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64265084 + 64265085.

It is an arithmetic number, because the mean of its divisors is an integer number (64265085).

Almost surely, 2^128530169 is an apocalyptic number.

It is an amenable number.

128530169 is a deficient number, since it is larger than the sum of its proper divisors (1).

128530169 is an equidigital number, since it uses as much as digits as its factorization.

128530169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 128530169 is about 11337.1146682037. The cubic root of 128530169 is about 504.6632647144.

The spelling of 128530169 in words is "one hundred twenty-eight million, five hundred thirty thousand, one hundred sixty-nine".