2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97.
97
There are 25 prime numbers between 1 and 100, all of them can be factors.
less than 100
The prime numbers between 50 and 100 are 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97.
220
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97.
97
There are 25 prime numbers between 1 and 100, all of them can be factors.
All prime numbers are odd except for 2 which is the only even prime number
269
1060
A single number cannot be relatively prime. Any pair of numbers between 50 and 100 of which one is a prime will be relatively prime. There are 728 pairs of numbers that are relatively prime and I have neither the time nor patience to list them all!
2,3,5,7,11,13,17,19,23,29,31,37,41,43,51,53,57,59,61,67,69,71,73,79,83,89,97. type in prime numbers and click on wikipedia and they will be listed there too.
There is just one of them and it is 97
The sum is 1,060
97 is the only one.