571

This number is a prime.

NBC News reported in June 2001 that there are 571 stoplights along U.S. Route 66.

USS Nautilus (SSN-571) was the world's first nuclear-powered submarine. [Mostow]

571=√[326049-8] is a pandigital expression. [Leonardis]

The "Keywords" page at Prime Curios! offers a "Search our Curios!" with advanced search options that contains a list of 571 MySQL Stopwords. [Green]

571-(5²+7²+1²) = 571-75 is a perfect number. Remarkably, the second expression is palindromic. [Leonardis]

The race between even and odd Honaker numbers is equal for the first time at 571. Is this the only prime number for which the two are equal? See PC10109.

571 is the smallest Honaker number that is the reversal of a smaller one. [Gaydos]

666 is the 571st unhappy number. [Gaydos]

There are 571 prime gaps in the first 1,000 primes which are twice a prime number. [Nie]

Fibonacci(571) is prime and represents the largest three-digit index for which this is true. [Schiffman]