PalPrimes

A palindromic-prime or PalPrime is a prime number that is also a palindrome.The first few PalPrimes are \(2, 3, 5, 7, 11, 101, 131, 151, 181, 191...\). Let \(S\) be the sum of the digits of the largest PalPrime \(N\) such that \(N<10^9\).What is the value of \(S\)?

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