128506559 has 2 divisors, whose sum is σ = 128506560. Its totient is φ = 128506558.

The previous prime is 128506549. The next prime is 128506579. The reversal of 128506559 is 955605821.

It is a weak prime.

It is an emirp because it is prime and its reverse (955605821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128506559 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128506549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64253279 + 64253280.

It is an arithmetic number, because the mean of its divisors is an integer number (64253280).

Almost surely, 2^128506559 is an apocalyptic number.

128506559 is a deficient number, since it is larger than the sum of its proper divisors (1).

128506559 is an equidigital number, since it uses as much as digits as its factorization.

128506559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 41.

The square root of 128506559 is about 11336.0733501508. The cubic root of 128506559 is about 504.6323619066.

The spelling of 128506559 in words is "one hundred twenty-eight million, five hundred six thousand, five hundred fifty-nine".