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The number 13.

A friend of a number n is another number m such that (m,n) is a friendly pair.

A negative number multiplied by another negative number gives a positive number.

A term for number theory.

The operator I^~ which takes a real number to the same real number I^~r=r.

The number p in a fraction p/q, i.e., the dividend.

The number of empty neighbors of a cluster.

The number q in a star polygon {p/q}.

The product of any number of perspectivities.

A dozen dozen, also called a gross. 144 is a square number and a sum-product number.