128117 has 8 divisors (see below), whose sum is σ = 147360. Its totient is φ = 110160.

The previous prime is 128113. The next prime is 128119. The reversal of 128117 is 711821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128117 - 2² = 128113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98 + ... + 515.

It is an arithmetic number, because the mean of its divisors is an integer number (18420).

2¹²⁸¹¹⁷ is an apocalyptic number.

It is an amenable number.

128117 is a deficient number, since it is larger than the sum of its proper divisors (19243).

128117 is a wasteful number, since it uses less digits than its factorization.

128117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643.

The product of its digits is 112, while the sum is 20.

The square root of 128117 is about 357.9343515227. The cubic root of 128117 is about 50.4121926074.

Adding to 128117 its reverse (711821), we get a palindrome (839938).

The spelling of 128117 in words is "one hundred twenty-eight thousand, one hundred seventeen".