Names of 999
| Nominal | 999 |
| Cardinal | nine hundred ninety-nine |
| Ordinal | 999th |
| This number as US currency | nine hundred ninety-nine dollars |
| 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 number |
| Is 999 a triangle number? | 999 is NOT a triangle number |
999 in other Bases
| Base 2 (Binary) | 11111001112 |
| Base 3 (Ternary) | 11010003 |
| Base 4 (Quaternary) | 332134 |
| Base 5 (Quinary) | 124445 |
| Base 6 (Senary) | 43436 |
| Base 8 (Octal) | 17478 |
| Base 12 (Duodecimal) | 6B312 |
| Base 16 (Hexadecimal) | 3E716 |
| Base 20 (Vigesimal) | 29J20 |
Primes and Factors tests for 999
| Is 999 a Prime Number? | 999 is NOT a prime |
| 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 |
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999 in other Numerals
| 999 in Roman Numeral | CMXCIX |
| 999 in Chinese Numeral | 玖佰玖拾玖 |
| 999 in Egyptian Numeral | 𓍪𓎎𓐂 |
| 999 in Babylonian Numeral |   |
Roots and stuff 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 the number 999 | 31.606961258558 |
| Cube root of the number 999 | 9.9966655549379 |
Recreational math for 999
| Number 999 reversed | 999 |
| Sum of the digits | 27 |
| No of digits | 3 |