241 (number)

This article is about the number. For the year, see 241. For other uses, see 241 (disambiguation).

For uses of the phrase "two for one", see Two for one.

← 240 241 242 →
← 240 241 242 243 244 245 246 247 248 249 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred forty-one
Ordinal	241st (two hundred forty-first)
Factorization	prime
Prime	twin prime
Greek numeral	ΣΜΑ´
Roman numeral	CCXLI, ccxli
Binary	111100012
Ternary	222213
Senary	10416
Octal	3618
Duodecimal	18112
Hexadecimal	F116

241 (two hundred [and] forty-one) is the natural number between 240 and 242. It is also a prime number.

In mathematics

241 is the larger of the twin primes (239, 241). Twin primes are pairs of primes separated by 2.

241 is a regular prime and a lucky prime.

Since 241 = 15 × 2⁴ + 1, it is a Proth prime.

241 is a repdigit in base 15 (111).

241 is the only known Lucas–Wieferich prime to (U, V) = (3, −1).

241 is a super-prime, because it is the 53rd prime and 53 is also prime.

In Chemistry

Americium-241 is the most common isotope of Americium, used in smoke detectors.

In popular culture

• Reel Big Fish wrote a song entitled "241," where the number is repeated as the only lyric.
• Another song entitled "241" is sung by Filipino band Rivermaya.

See also

• List of highways numbered 241