81 (number)

The Simple English Wiktionary has a definition for: eighty-one.
← 80 81 82 →
Cardinaleighty-one
Ordinal81st
(eighty-first)
Factorization34
Greek numeralΠΑ´
Roman numeralLXXXI
Binary10100012
Ternary100003
Quaternary11014
Quinary3115
Senary2136
Octal1218
Duodecimal6912
Hexadecimal5116
Vigesimal4120
Base 362936

Eighty-one is a number. It comes between eighty and eighty-two, and is an odd number. It is also a square number.

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