501 (number)
Encyclopedia
501 is the natural number
Natural number
In mathematics, the natural numbers are the ordinary whole numbers used for counting and ordering . These purposes are related to the linguistic notions of cardinal and ordinal numbers, respectively...

 following 500
500 (number)
500 is the natural number following 499 and preceding 501.- Other fields :Five hundred is also*many NASCAR races often use the number 500 at the end of their race names 500 (five hundred) is the natural number following 499 and preceding 501.- Other fields :Five hundred is also*many NASCAR races...

 and followed by 502.

501 is the sum of the first eighteen primes
Prime number
A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number. For example 5 is prime, as only 1 and 5 divide it, whereas 6 is composite, since it has the divisors 2...

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