99 (number)
99 (ninety-nine) is the natural number following 98 and preceding 100.
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| Cardinal | ninety-nine | |||
| Ordinal | 99th (ninety-ninth) | |||
| Factorization | 32 × 11 | |||
| Divisors | 1, 3, 9, 11, 33, 99 | |||
| Greek numeral | ϞΘ´ | |||
| Roman numeral | XCIX | |||
| Binary | 11000112 | |||
| Ternary | 102003 | |||
| Octal | 1438 | |||
| Duodecimal | 8312 | |||
| Hexadecimal | 6316 | |||
| Chinese/Japanese /Korean numeral | 九十九 | |||
In mathematics
99 is:
- a Kaprekar number[1]
- a lucky number
- a palindromic number
- the ninth repdigit
- the sum of the cubes of three consecutive integers: 99 = 23 + 33 + 43
- the sum of the sums of the divisors of the first 11 positive integers.[2]
- the highest two digit number in decimal.
In science
- The atomic number of einsteinium, an actinide.
References
- "Sloane's A006886 : Kaprekar numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
- Sloane, N. J. A. (ed.). "Sequence A024916 (sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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