HTTP 503 is the standard HTTP error that means "Service Unavailable."
A 503 error is a universal error code. It usually means there is a problem within the server itself, such as an overload.
The 503 Service Unavailable error means the web site's server is not available right now.
Opera Mini
The factors of 503 are: 1, 503.
503 hundredths in decimal = 5.03
1 x 503, 503 x 1
503 = 50,300%
Look it up here: http://primes.utm.edu/lists/small/1000.txt
503 is.
503
503/100
503 is prime.