215 (number)

← 214 215 216 →
← 210 211 212 213 214 215 216 217 218 219 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred fifteen
Ordinal	215th (two hundred fifteenth)
Factorization	5 × 43
Divisors	5, 43
Greek numeral	ΣΙΕ´
Roman numeral	CCXV, ccxv
Binary	110101112
Ternary	212223
Senary	5556
Octal	3278
Duodecimal	15B12
Hexadecimal	D716

215 (two hundred [and] fifteen) is the natural number following 214 and preceding 216.

In mathematics

• 215 is a composite number and a semiprime ($=5\times 43$).
• $215=(3!)^{3}-1$.
• 215 is the second smallest integer (after 5) such that $n^{2}-17$ is twice a square: $215^{2}-17=2\times 152^{2}$.
• 215 is a vertically symmetric number on a calculator display (sequence A053701 in the OEIS).

In other fields

• 215 is often used as slang for marijuana, from California Proposition 215, legalizing it for medical use.