81

Summary

81 is a positive integer^[1]. 81 ranks in the top 9% of positive_integer entities by monthly Wikipedia readership (237 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 Freebase ID is recorded as /m/022sq6^[12].
• 81's numeric value is recorded as {'amount': '+81'}^[13].
• 81's BabelNet ID is recorded as 03113855n^[14].
• 81's code is recorded as ௮௰௧^[15].
• 81's code is recorded as ௮௧^[16].
• 81's code is recorded as LXXXI^[17].
• 81's code is recorded as 𒐕𒎙𒐕^[18].
• 81's code is recorded as 1010001^[19].
• 81's code is recorded as 10000^[20].
• 81's code is recorded as 1101^[21].
• 81's code is recorded as 311^[22].
• 81's code is recorded as 213^[23].
• 81's code is recorded as 144^[24].
• 81's code is recorded as 100^[25].
• 81's code is recorded as 121^[26].
• 81's code is recorded as 81^[27].

Why It Matters

81 ranks in the top 9% of positive_integer entities by monthly Wikipedia readership (237 views/month).^[2] 81 has Wikipedia articles in 27 language editions, a strong signal of global cultural recognition.^[28] 81 is known by 34 alternative names across languages and contexts.^[29]