128802529 has 2 divisors, whose sum is σ = 128802530. Its totient is φ = 128802528.

The previous prime is 128802497. The next prime is 128802533. The reversal of 128802529 is 925208821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91164304 + 37638225 = 9548^2 + 6135^2 .

It is an emirp because it is prime and its reverse (925208821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128802529 - 2⁵ = 128802497 is a prime.

It is not a weakly prime, because it can be changed into another prime (128802589) 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, 64401264 + 64401265.

It is an arithmetic number, because the mean of its divisors is an integer number (64401265).

Almost surely, 2^128802529 is an apocalyptic number.

It is an amenable number.

128802529 is a deficient number, since it is larger than the sum of its proper divisors (1).

128802529 is an equidigital number, since it uses as much as digits as its factorization.

128802529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 128802529 is about 11349.1201861642. The cubic root of 128802529 is about 505.0194796917.

The spelling of 128802529 in words is "one hundred twenty-eight million, eight hundred two thousand, five hundred twenty-nine".