133 (number)
133 (one hundred [and] thirty-three) is a natural number. It is after 132 and before 134.
| ||||
|---|---|---|---|---|
| Cardinal | one hundred and thirty-three | |||
| Ordinal | 133rd (one hundred and thirty-third) | |||
| Factorization | 7 · 19 | |||
| Divisors | 1, 7, 19, 133 | |||
| Roman numeral | CXXXIII | |||
| Binary | 100001012 | |||
| Ternary | 112213 | |||
| Quaternary | 20114 | |||
| Quinary | 10135 | |||
| Senary | 3416 | |||
| Octal | 2058 | |||
| Duodecimal | B112 | |||
| Hexadecimal | 8516 | |||
| Vigesimal | 6D20 | |||
| Base 36 | 3P36 | |||
In mathematics
The sum of 133's proper divisors is equal to φ(n).
133 is an octagonal number,[1] a Harshad number[2] and a happy number.[3]
In base 11(111) and base 18(77), 133 is a repdigit(a natural number that has only one type of digit).
133 is a semiprime number number(a product of 7 and 19). 7 and 19 are both Gaussian primes. This makes that 133 is a Blum integer
In other fields
133 is also:
- The atomic number of the element called untritrium.
- Xenon-133 is an isotope of xenon.
- 133 is the police emergency telephone number in Chile
- "133" is the name of a David Guetta song, from the album Just a Little More Love
- In Austria, the phone number for the police.[4]
References
- ↑ "Sloane's A000567 : Octagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
- ↑ "Sloane's A005349 : Niven (or Harshad) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
- ↑ "Sloane's A007770 : Happy numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
- ↑ Porter, Darwin; Danforth Prince (2009). Frommer's Austria. Hoboken, New Jersey: Frommer's. p. 482. ISBN 978-0-470-39897-5.