243 (number)

Number|number = 243
range = 200s
cardinal = two hundred [and] forty-three
ordinal = rd
ordinal text = two hundred [and] forty-third
numeral =
factorization = $3^4$
prime =
divisor =
roman = CCXLIII
unicode =
greek prefix =
latin prefix =
bin = 111110011
oct =
duo =
hex = F3
misc =

243 ("two hundred [and] forty-three") is the natural number following 242 and preceding 244.

In mathematics

243 is a power of 3.
243 is a perfect totient number.
It is the sum of five consecutive prime numbers (41 + 43 + 47 + 53 + 59).
Two hundred forty-three is also an 82-gonal number.

Harshad number

In other fields

243 is:
* the Calling code for Zaire.
* the number of isotopes or variations of elements calculated by Dr. Plichta.
* the year 243 CE or 243 BCE.
* the flight number of an Aloha Airlines flight which crashed near Maui, HI on April 28, 1988
* The .243 Winchester is a very popular sporting rifle round