19th
|
||||
|---|---|---|---|---|
| Cardinal | nineteen | |||
| Ordinal | 19th (nineteenth) |
|||
| Numeral system | nonadecimal | |||
| Factorization | prime | |||
| Divisors | 1, 19 | |||
| Roman numeral | XIX | |||
| Binary | 100112 | |||
| Ternary | 2013 | |||
| Quaternary | 1034 | |||
| Quinary | 345 | |||
| Senary | 316 | |||
| Octal | 238 | |||
| Duodecimal | 1712 | |||
| Hexadecimal | 1316 | |||
| Vigesimal | J20 | |||
| Base 36 | J36 | |||
19 (nineteen) is the natural number following 18 and preceding 20. It is a prime number.
19 is a prime number.
19 is the seventh Mersenne prime exponent.
19 is the maximum number of fourth powers needed to sum up to any natural number. It is the fourth value of g(k).
19 is the lowest prime centered triangular number, a centered hexagonal number and a Heegner number.
The only non-trivial normal magic hexagon contains 19 hexagons (the other being 1).
In the Bábí and Bahá'í faiths, a group of 19 is called a Váhid, a Unity (Arabic: واحد wāhid, "one"). The numerical value of this word in the Abjad numeral system is 19.
...
Wikipedia