There are 25 prime numbers between 1 and 100, all of them can be factors.
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.
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!
There is just one of them and it is 97
97 is the only one.
The sum is 1,060
Yes. The only even prime number is 2.