A "perfect number" is defined to be a number such that all of its factors - smaller than the number itself - add up to the number. Examples:
6 = 1 + 2 + 3
28 = 1 + 2 + 4 + 7 + 14
11 is not equal to its only factor (smaller than itself), the number 1.
A perfect number cannot be a prime.
Yes, the only factors of 11 are 1 and 11.It is prime.
11 + 12 + 9 = 32
It's a Prime number
no, but I don't know why. One is not a prime number and by definition of a perfect number one must be a prime number.
11 is a prime number. Its only prime factor is 11.
11 is prime.
11 is a prime number.
11 is a prime number, as its only factors are itself and one11, it doesnt have much because it is a prime numberIt is 11 because 11 is a prime number
The next perfect number after 11 is 28.
11 is a prime
No, it is not.Incidentally, is a number p is prime then its 2 factors are 1 and p. Their sum is p+1.If p is a perfect number then this sum must be 2p.That is, p+1 = 2p or p = 1.But 1 is not a prime. So no prime can be a perfect number and since 13 is prime, it cannot be a perfect number.