81 in words
British English
eighty-one
Quick reference
- In figures
- 81
- British English
- eighty-one
- American English
- The same (why they differ)
- Ordinal
- eighty-first (81st)
- Roman numeral
- LXXXI
- Place value
- 8 in the tens column; 1 in the ones column
- Expanded form
- 80 + 1
- Standard form
- 8.1 × 10¹
- Even or odd
- Odd
- Prime factors
- 3⁴
Convert any other number, up to thirty-six digits.