It is 100, which does not belong to any other number!
The phone number belong to my friend Michael,
It is a prime number
One reason the number 89 does not belong is because it is a prime number and the other numbers are not.
4 doesn't belong because it's an even number.
It is a rational number and a real number. a positive number.
That number doesn't belong to anyone.
Trees
UPS
i have no answers for this sorry.
There is only one number, so "which number" makes no sense!
123 does not belong because it isn't in the 3s multiplication 31 does not belong because it isn't in the 3s multilplication