Six hundred nine.
Or to be more grammatically- 'Six-hundred and nine'.
609 = 609/1
that is expanded form but you can also write it in scientific notation which would be 6.09 x10^2
609 is a Composite Number.
The factors of 609 are: 1, 3, 7, 21, 29, 87, 203, 609.
CDIX is supposed to represent 409
899
609
609 = 3 x 7 x 29 609 203,3 29,7,3
72 ÷ 100 × 609 = 438.48
609 x 135 = 82215
203
609