990
992
The Number 991: Properties and Meanings
991 is a Prime Number.
991 is a Centered 15-gonal Number.
991 is a Centered 18-gonal Number.
991 is a Centered 22-gonal Number.
991 is the maximal number of regions into which 44 lines divide a plane.
The Year 991 AD
In the year 991 AD...
990
992