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Noun number-one has 3 senses
number one - a reference to yourself or myself etc.; `take care of number one' means to put your own interests first--1 is a kind of self
 
first, number one - the first or highest in an ordering or series; "He wanted to be the first"--2 is a kind of rank
 --2 has particulars: former
 
first, number one, number 1 - the first element in a countable series; "the first of the month"--3 is a kind of ordinal number, ordinal, no.
 
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