27691 is a member of OEIS A174402: primes such that applying "reverse and add" twice produces two more primes, here 47363 and 83737. The sequence leading to the palindrome is (permalink): [27691, 47363, 83737, 157475, 732226, 1354463, 4998994]

27691 forms a twin prime with 27689

27691 is a lucky number.

27691 can be rendered as a digit equation as follows:

2 * 7 - 6 = 9 - 1