81 (number)

← 80 81 82 →
Cardinaleighty-one
Ordinal81st
(eighty-first)
Factorization34
Divisors1, 3, 9, 27, 81
Greek numeralΠΑ´
Roman numeralLXXXI, lxxxi
Binary10100012
Ternary100003
Senary2136
Octal1218
Duodecimal6912
Hexadecimal5116

81 (eighty-one) is the natural number following 80and preceding 82.

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