9 belongs in the sets:
-Natural number set, positive whole numbers
-Integer number set, whole numbers
-Rational number set, numbers that are not never ending
-Real number set, basic numbers without i and that can be expressed in say amounts of apples
-Complex number set, the set that contains both real and unreal numbers
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-5
Counting numbers
Infinitely many sets: they belong to the set {0, 2, 4, 5, 7, 9}, and to {0, 2, 4, 5, 7, 9, 92} and {0, 2, 3, 4, 5, 7, 9} and {0, 2, 4, 5, 5.35, 7, 9} and {0, 2, 4, 5, 7, sqrt(53), 9} and N0, the set of Natural number including 0, Z, the set of integers, Q, the set of rational numbers, R, the set of real numbers, C, the set of complex numbers as well as any superset of these sets.
rational and prime numbers
It belongs to the set of negative rational numbers, negative real numbers, fractionall numbers, rational numbers, real numbers.