37
36,201 is not a prime number because 3 is one of its factors. 3 is one of the factors of any number whose digits add up to 3 or a multiple of 3. The only prime number with 3 as one of its factors is the number 3.
This question doesn't quite make sense; a prime number has no factors.If you meant a prime whose digits sum to 10 it is 37.
17
44. 11*4=44 11+4= 15
The smallest prime number, of course, is 2. The smallest prime number whose digits add up to 2 is, of course, 2. The next-smallest is 11. It is left as an exercise for the reader to determine whether the other numbers whose digits add up to 2 (e.g. 101, 1001, 10001) are prime.
67
Two-digit prime numbers whose digits add up to 10 are:193773
Find the prime factorization. Identify the distinct prime factors. Add them up.
Prime. It is only divisible by itself and one.
21 and 30 if you're only counting distinct factors. Add 25 and 32 if you're not.
23 or 41
A perfect number is a positive integer whose factors (excluding the number itself) add up the number; 6 is a perfect number: 1 x 2 x 3 = 6 1 + 2 + 3 = 6 Prime numbers, by definition, don't have factors, so cannot be perfect. In fact, it may be that odd numbers can't be perfect.