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Also known as eighty one, eighty-one
自然数
AI overview
81 is a natural number that comes after 80 and before 82. It is notable because it equals 3 to the fourth power (3⁴) and is also a perfect square (9 × 9).
AI-generated from the Wikipedia summary — may contain errors.
Wikidata facts
- Instance of
- harshad number
Show 6 more facts
- code
- 10000
- maintained by WikiProject
- WikiProject Mathematics
- Commons category
- 81 (number)
- numeric value
- 81
- prime factor
- 3
- number of decimal digits
- 2
Sources (1)
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Article · 日本語
81（八十一、八一、はちじゅういち、やそひと、やそじあまりひとつ）は、自然数また整数において、80の次で82の前の数である。
Abstract from DBpedia / Wikipedia · CC BY-SA
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