Blend number 1009 (3)

I believe the answer is:
mix
This might be a double definition.
'blend number' is the first definition.
'mix' can be an answer for 'blend' (synonyms). I am not certain of the 'number' bit.
'1009' is the second definition.
(MIX is 1009 in Roman numerals )
Can you help me to learn more?
(Other definitions for mix that I've seen before include "= 1,009 (L.)" , "Amalgamate, blend" , "Associate" , "Combine into one" , "Get on" .)
