Yes. 491 is prime.
Itself and 1 because 491 is a prime number
Factors of 491491 is a prime number. Its only factors are 1 and 491.
A perfect number is equal to the sum of its proper positive divisors.A mirror perfect number is equal to the sum of its proper positive divisors when they are read backwards.From a paper by Joseph L. Pe which is available on the 'net:10311 = 1 + 3 + 7 + 21 + 491 + 1473 + 34377343 + 3741 + 194 + 12 + 7 + 3 + 1 = 1130110311 is perfect and mirror perfect.
491
+491 is a prime number because it has only two factors which are itself and one.
0.0143
1718-491-2122 ( i think)!
100 + 391 = 491
290 plus 500
It is a prime number because it has only 2 factors which are itself and one
The DUNS number for Royal Dutch Shell is 53-491-0609.