+91 is a [Natural Number](/wiki/Natural_Number) following 90 and preceding 92. It is a [Composite Number](/wiki/Composite_Number), being the product of the prime numbers 7 and 13. As an odd number, 91 possesses distinct properties within number theory.
+## See also
+- [Number](/wiki/Number)
+- [Integer](/wiki/Integer)
+- [Prime Number](/wiki/Prime_Number)
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