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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.
In the Vinony graph
Within Vinony's link graph, 81 is referenced by 435 other articles, and connects out to Japan, Taoism and natural number.
It is catalogued under the topic Integers.
Its subject is documented across 76 Wikipedia language editions.
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)
via Wikidata · CC0
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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