159 (one hundred [and] fifty-nine) is a natural number following 158 and preceding 160.

159 is:

• the sum of 3 consecutive prime numbers: 47 + 53 + 59.
• a Woodall number.^[1]
• equal to the sum of the squares of the digits of its own square in base 15.^[2]

Only 5 numbers (greater than 1) have this property in base 15, none in base 10.

• written CLIX in Roman numeral, which spells a proper noun with multiple meanings.

Given 159, the Mertens function returns 0.^[3]

Wikimedia Commons has media related to 159 (number).

• Number Facts and Trivia: 159
• The Number 159
• VirtueScience: 159 Archived 2021-02-01 at the Wayback Machine
• 159th Medical Detachment
• Farewell to Routemaster Bus 159