128505559 has 16 divisors (see below), whose sum is σ = 158428480. Its totient is φ = 101502720.

The previous prime is 128505557. The next prime is 128505613. The reversal of 128505559 is 955505821.

It is a cyclic number.

It is not a de Polignac number, because 128505559 - 2¹ = 128505557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128505557) 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 in 15 ways as a sum of consecutive naturals, for example, 96619 + ... + 97939.

It is an arithmetic number, because the mean of its divisors is an integer number (9901780).

Almost surely, 2^128505559 is an apocalyptic number.

128505559 is a deficient number, since it is larger than the sum of its proper divisors (29922921).

128505559 is a wasteful number, since it uses less digits than its factorization.

128505559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410.

The product of its (nonzero) digits is 90000, while the sum is 40.

The square root of 128505559 is about 11336.0292430815. The cubic root of 128505559 is about 504.6310529366.

The spelling of 128505559 in words is "one hundred twenty-eight million, five hundred five thousand, five hundred fifty-nine".