501 is the natural number following 500 and followed by 502.
In mathematics
501 is the sum of the first eighteen primes.
In other fields
501 is also:
- A type of Levi's jeans
- The record score in first-class cricket by Brian Lara, and also Lara's brand of clothing in honour of this event
- HTTP status code indicating server does not support facility required
- SMTP status code meaning syntax error in parameters
- 501(c) is a type of tax exemption for non-profit organizations in the United States
- 501 is also the name of a game of darts
- The 501st legion was a group of clone troopers/stormtroopers in the Star Wars saga named after the Star Wars costuming group of the same name.
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