128860217 has 2 divisors, whose sum is σ = 128860218. Its totient is φ = 128860216.

The previous prime is 128860177. The next prime is 128860219. The reversal of 128860217 is 712068821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128572921 + 287296 = 11339^2 + 536^2 .

It is an emirp because it is prime and its reverse (712068821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128860217 - 2¹⁶ = 128794681 is a prime.

Together with 128860219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128860219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64430108 + 64430109.

It is an arithmetic number, because the mean of its divisors is an integer number (64430109).

Almost surely, 2^128860217 is an apocalyptic number.

It is an amenable number.

128860217 is a deficient number, since it is larger than the sum of its proper divisors (1).

128860217 is an equidigital number, since it uses as much as digits as its factorization.

128860217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 128860217 is about 11351.6614202503. The cubic root of 128860217 is about 505.0948643797.

The spelling of 128860217 in words is "one hundred twenty-eight million, eight hundred sixty thousand, two hundred seventeen".