128585557 has 2 divisors, whose sum is σ = 128585558. Its totient is φ = 128585556.

The previous prime is 128585531. The next prime is 128585599. The reversal of 128585557 is 755585821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112911876 + 15673681 = 10626^2 + 3959^2 .

It is an emirp because it is prime and its reverse (755585821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128585557 - 2¹¹ = 128583509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128585057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64292778 + 64292779.

It is an arithmetic number, because the mean of its divisors is an integer number (64292779).

Almost surely, 2^128585557 is an apocalyptic number.

It is an amenable number.

128585557 is a deficient number, since it is larger than the sum of its proper divisors (1).

128585557 is an equidigital number, since it uses as much as digits as its factorization.

128585557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 560000, while the sum is 46.

The square root of 128585557 is about 11339.5571783029. The cubic root of 128585557 is about 504.7357464642.

The spelling of 128585557 in words is "one hundred twenty-eight million, five hundred eighty-five thousand, five hundred fifty-seven".