"mI' jav SoH."

Translation: You are number six.

[butsuri]

mI' jIHbe'! loD tlhab jIH!

[puyjaq]

I feel like it would be more natural to use the sentence javDIch SoH.

[jdmcowan]

Even in English there is an ever so slight difference between, "I'm number 6," and, "I'm sixth."