Speaking of syllables, there are 2,541 possible syllables in Klingon.
1,814 have been used
3 of them will never be used.
724 of them are totally unused.
Breaking down the used syllable count further we see that:205 of them only occur as part of a multi-syllable word
30 of them are only used as affixes.
28 of them are only found in a name of a place
10 of them only occur in a person's name
7 of them are only used as the name of a sound/letter
data obtained from yIH'a'na'