999
Everything about the number 999 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 999
| Nominal | 999 |
| Cardinal | nine hundred ninety-nine |
| Ordinal | 999th |
| This number as US currency | nine hundred ninety-nine dollars |
Properties (and some facts) of 999
| Is 999 an odd number? | 999 is an odd number |
| Is 999 an even number? | 999 is not an even number |
| Is 999 a palindrome? | 999 is a palindrome |
| Is 999 a triangle number? | 999 is not a triangle number |
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999 in other bases
| Base 2 (Binary) | 1111100111 |
| Base 3 (Ternary) | 1101000 |
| Base 4 (Quaternary) | 33213 |
| Base 5 (Quinary) | 12444 |
| Base 6 (Senary) | 4343 |
| Base 8 (Octal) | 1747 |
| Base 12 (Duodecimal) | 6B3 |
| Base 16 (Hexadecimal) | 3E7 |
| Base 20 (Vigesimal) | 29J |
Primes and factors tests for 999
| Is 999 a prime number? | 999 is not a prime number |
| Is 999 a perfect number? | 999 is not a perfect number |
| Is 999 a Mersenne prime? | 999 is not a Mersenne prime |
| Is 999 a Fermat prime? | 999 is not a Fermat prime |
| Is 999 a Fibonacci prime? | 999 is not a Fibonacci prime |
| Is 999 a partition prime? | 999 is not a partition prime |
| Is 999 a Pell prime? | 999 is not a Pell prime |
| Prime Factors | Prime factors of 999 |
999 in other numeral systems
| 999 in Roman numerals | CMXCIX |
| 999 in Chinese numerals | 玖佰玖拾玖 |
| 999 in Babylonian numerals |   |
| 999 in Egyptian numerals | 𓍪𓎎𓐂 |
Roots and squares for 999
| Is 999 a square number? | 999 is not a square number |
| Is 999 a cube number? | 999 is not a cube number |
| Square root of 999 | 31.606961258558 |
| Cube root of 999 | 9.9966655549379 |
Recreational math for 999
| Number 999 reversed | 999 |
| Sum of the digits | 27 |
| Number of digits | 3 |
Arithmetic tables for 999
Other pages about 999
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