You could write 9.81 in a few ways:
Nine point eight one
Nine dollars and eighty-one cents (if referring to money)
Nine and eighty-one hundredths
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981 is composite.
The positive integer factors of 981 are: 1, 3, 9, 109, 327, 981
The multiples of 981 (which are infinite) are all divisible by 981, including these: 981, 1962, 2943, 3924, 4905, 5886, 6867, 7848, 8829 . . .
327