128017 has 4 divisors (see below), whose sum is σ = 128740. Its totient is φ = 127296.

The previous prime is 127997. The next prime is 128021. The reversal of 128017 is 710821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 710821 = 17 ⋅41813.

It can be written as a sum of positive squares in 2 ways, for example, as 50176 + 77841 = 224^2 + 279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 127985 and 128003.

It is not an unprimeable number, because it can be changed into a prime (128047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109 + ... + 517.

It is an arithmetic number, because the mean of its divisors is an integer number (32185).

2¹²⁸⁰¹⁷ is an apocalyptic number.

It is an amenable number.

128017 is a deficient number, since it is larger than the sum of its proper divisors (723).

128017 is an equidigital number, since it uses as much as digits as its factorization.

128017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 128017 is about 357.7946338334. The cubic root of 128017 is about 50.3990730072.

Adding to 128017 its reverse (710821), we get a palindrome (838838).

The spelling of 128017 in words is "one hundred twenty-eight thousand, seventeen".