"Eighty-One" is a number that follows Eighty and precedes Eighty-Two. It is represented numerically as 81 and is an odd number. In mathematics, it can be expressed as the product of Nine and Nine (9 x 9), making it a perfect square. In various cultures, the number 81 holds significance. For example, in Chinese culture, it is associated with longevity and good fortune. Additionally, in numerology, the number 81 is often linked to personal growth and transformation, reflecting its mathematical properties and cultural meanings.