In today's world, 81 (number) has become a topic of great relevance and interest to all types of people. Whether due to its impact on society, its historical relevance or its importance in the scientific field, 81 (number) is a topic that arouses curiosity and debate in different sectors. Throughout history, 81 (number) has been the subject of study and research, generating a large body of knowledge that continues to be explored and questioned today. Therefore, it is of great interest to delve into the different aspects that 81 (number) covers, from its origins to its implications in daily life.
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Cardinal | eighty-one | |||
Ordinal | 81st (eighty-first) | |||
Factorization | 34 | |||
Divisors | 1, 3, 9, 27, 81 | |||
Greek numeral | ΠΑ´ | |||
Roman numeral | LXXXI | |||
Binary | 10100012 | |||
Ternary | 100003 | |||
Senary | 2136 | |||
Octal | 1218 | |||
Duodecimal | 6912 | |||
Hexadecimal | 5116 |
81 (eighty-one) is the natural number following 80 and preceding 82.
81 is:
The inverse of 81 is 0.012345679 recurring, missing only the digit "8" from the complete set of digits. This is an example of the general rule that, in base b,
omitting only the digit b−2.
Eighty-one is also: