85
Everything about the number 85 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 85
| Nominal | 85 |
| Cardinal | eighty-five |
| Ordinal | 85th |
| This number as US currency | eighty-five dollars |
Properties (and some facts) of 85
| Is 85 an odd number? | 85 is an odd number |
| Is 85 an even number? | 85 is not an even number |
| Is 85 a palindrome? | 85 is not a palindrome |
| Is 85 a triangle number? | 85 is not a triangle number |
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85 in other bases
| Base 2 (Binary) | 1010101 |
| Base 3 (Ternary) | 10011 |
| Base 4 (Quaternary) | 1111 |
| Base 5 (Quinary) | 320 |
| Base 6 (Senary) | 221 |
| Base 8 (Octal) | 125 |
| Base 12 (Duodecimal) | 71 |
| Base 16 (Hexadecimal) | 55 |
| Base 20 (Vigesimal) | 45 |
Primes and factors tests for 85
| Is 85 a prime number? | 85 is not a prime number |
| Is 85 a perfect number? | 85 is not a perfect number |
| Is 85 a Mersenne prime? | 85 is not a Mersenne prime |
| Is 85 a Fermat prime? | 85 is not a Fermat prime |
| Is 85 a Fibonacci prime? | 85 is not a Fibonacci prime |
| Is 85 a partition prime? | 85 is not a partition prime |
| Is 85 a Pell prime? | 85 is not a Pell prime |
| Prime Factors | Prime factors of 85 |
85 in other numeral systems
| 85 in Roman numerals | LXXXV |
| 85 in Chinese numerals | 捌拾伍 |
| 85 in Babylonian numerals |   |
| 85 in Egyptian numerals | 𓎍𓏾 |
Roots and squares for 85
| Is 85 a square number? | 85 is not a square number |
| Is 85 a cube number? | 85 is not a cube number |
| Square root of 85 | 9.2195444572929 |
| Cube root of 85 | 4.3968296721582 |
Recreational math for 85
| Number 85 reversed | 58 |
| Sum of the digits | 13 |
| Number of digits | 2 |
Arithmetic tables for 85
Other pages about 85
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