501

501 = 3 x 167.

501 is the sum of the first 18 prime numbers.

501 is the number of partitions of five items into ordered lists.

501 is the sum of 11 positive fifth powers: 501 = 3⁵ + 2⁵ + 2⁵ + 2⁵ + 2⁵ + 2⁵ + 2⁵ + 2⁵ + 2⁵ + 1⁵ + 1⁵.

Telephone area code 501 covers Little Rock, Arkansas.

Source: What's Special About This Number?