81
natural number
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Summary
81 is a positive integer[1]. 81 ranks in the top 9% of positive_integer entities by monthly Wikipedia readership (944 views/month).[2]
Key Facts
- 81's instance of is recorded as positive integer[3].
- 81's instance of is recorded as odd number[4].
- 81's instance of is recorded as square number[5].
- 81's instance of is recorded as centered octagonal number[6].
- 81's instance of is recorded as heptagonal number[7].
- 81's instance of is recorded as composite number[8].
- 81's instance of is recorded as power of three[9].
- 81's instance of is recorded as harshad number[10].
- 81's Commons category is recorded as 81 (number)[11].
- 81's numeric value is recorded as {'amount': '+81'}[12].
- 81's code is recorded as ௮௰௧[13].
- 81's code is recorded as ௮௧[14].
- 81's code is recorded as LXXXI[15].
- 81's code is recorded as 𒐕𒎙𒐕[16].
- 81's code is recorded as 1010001[17].
- 81's code is recorded as 10000[18].
- 81's code is recorded as 1101[19].
- 81's code is recorded as 311[20].
- 81's code is recorded as 213[21].
- 81's code is recorded as 144[22].
- 81's code is recorded as 100[23].
- 81's code is recorded as 121[24].
- 81's code is recorded as 81[25].
- 81's code is recorded as 74[26].
- 81's code is recorded as 69[27].
Body
Definition and Type
Recorded instance of include positive integer[3], odd number[4], square number[5], centered octagonal number[6], heptagonal number[7], and composite number[8].
Why It Matters
81 ranks in the top 9% of positive_integer entities by monthly Wikipedia readership (944 views/month).[2] 81 has Wikipedia articles in 27 language editions, a strong signal of global cultural recognition.[28] 81 is known by 37 alternative names across languages and contexts.[29]