128905559 has 2 divisors, whose sum is σ = 128905560. Its totient is φ = 128905558.

The previous prime is 128905507. The next prime is 128905603. The reversal of 128905559 is 955509821.

It is an a-pointer prime, because the next prime (128905603) can be obtained adding 128905559 to its sum of digits (44).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128905559 - 2⁸ = 128905303 is a prime.

It is a super-2 number, since 2×128905559² = 33233286282204962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128905159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64452779 + 64452780.

It is an arithmetic number, because the mean of its divisors is an integer number (64452780).

Almost surely, 2^128905559 is an apocalyptic number.

128905559 is a deficient number, since it is larger than the sum of its proper divisors (1).

128905559 is an equidigital number, since it uses as much as digits as its factorization.

128905559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162000, while the sum is 44.

The square root of 128905559 is about 11353.6583971863. The cubic root of 128905559 is about 505.1540999509.

The spelling of 128905559 in words is "one hundred twenty-eight million, nine hundred five thousand, five hundred fifty-nine".