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Real numbers are simply the combination of Whole numbers, Integers, Rational and Irrational numbers in the number system.

Suppose a, b, and c is three real numbers.

Commutative Property of Multiplication:

Property: $\text{a}  ·  \text{b}  =\text{b}  ·  \text{a}  $ or $\text{a}  ·  \text{b}  ·  \text{c}=\text{b}  ·  \text{c}  ·  \text{a}$

If you multiply two or three real numbers in any order, their product will always be the same.

Example: $\text{12}  ·  \text{4}  =\text{4}  ·  \text{12}  =  48$ or $\text{5}  ·  \text{6}  ·  \text{4}=\text{6}  ·  \text{4}  ·  \text{5}  \text{=}  \text{120}$

Commutative property of Multiplication states that If you multiply two or three real numbers in any order, their product will always be the same.

Property: $\text{a}  ·  \text{b}  =\text{b}  ·  \text{a}  $

So, the expression $19·5^3=5^3·19$ represents the Commutative Property of Multiplication.