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81

80 ← 81 → 82
읽는 법팔십일
세는 법여든하나
한자八十一
소인수 분해34
로마 숫자LXXXI
2진수10100012
3진수100003
4진수11014
5진수3115
6진수2136
8진수1218
12진수6912
16진수5116
20진수4120
36진수2936
φ(81)54
σ*(81)82
d(81)5
σ(81)121
μ(81)0
M(81)-4
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81(팔십일)은 80보다 크고 82보다 작은 자연수이다.

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81
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