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91 수학 과학 기타 둘러보기 메뉴eheh문서를 완성해

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정수


수 목록정수9092자연수












91




위키백과, 우리 모두의 백과사전.



TedBot(토론 | 기여)님의 2019년 1월 5일 (토) 21:53 판 (봇: 정수 틀 부착)

(차이) ← 이전 판 | 최신판 (차이) | 다음 판 → (차이)






둘러보기로 가기
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90 ← 91 → 92


← 90 91 92 93 94 95 96 97 98 99 →



← 0 10 20 30 40 50 60 70 80 90 →

읽는 법
구십일
세는 법
아흔하나
한자
九十一
소인수 분해
7 × 13
로마 숫자
XCI
2진수
10110112
3진수
101013
4진수
11234
5진수
3315
6진수
2316
8진수
1338
12진수
7712
16진수
5B16
20진수
4B20
36진수
2J36
φ(91)
72
σ*(91)
112

d(91)

4
σ(91)
112
μ(91)
1

M(91)

-1

수 목록 · 정수


v  d  e  h

91(구십일)은 90보다 크고 92보다 작은 자연수이다.



수학



  • 합성수로, 그 약수는 1, 7, 13, 91이다.

  • 13번째 삼각수이다.

  • 91 = 63 + ( − 5)3 = 43 + 33 서로 다른 두 가지 방법으로 두 정수의 세제곱수의 합으로 나타낼 수 있는 수 중 가장 작은 수이다. 마찬가지로 자연수의 세제곱수로 가능한 수는 1729이다.


과학



  • 프로트악티늄(Pa)의 원자번호.


기타



  • 개신교에서는 이 숫자가 "구원"의 의미로 쓰이기 때문에 교회나 목사관, 혹은 선교 단체의 전화 번호에 주로 들어간다.






원본 주소 "https://ko.wikipedia.org/w/index.php?title=91&oldid=23421115"













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