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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The only threedigit prime repfigit number. [Trotter] 197 and 2^{197} * 197#  1 are primes. [Boland] The first three digits of the prime 197 * 197! + 1 are 197. [Luhn] Surrey and England batsman Jack Hobbs scored a record 197 centuries. The sum of the first dozen primes. [Brod] The smallest prime number that is the sum of 7 consecutive prime numbers (17+19+23+29+31+37+41). [Schuler] 197 is the sum of digits of all twodigit primes. [Gallardo] The smallest multidigit prime p that makes 10^p9 prime. Note that the next prime (199) has the same property. They are twin primes! [Gallardo] This prime is the smallest number to be the sum of repdigits of its digits: 111 + 9 + 77 = 197. [Post] The sum of the squares of all the four composite digits (4^2 + 6^2 + 8^2 + 9^2). [Silva] The digits contained in twodigit primes under 100, up to 97, sum to 100+97. [Silva] 19 x 7 + (1 x 9 x 7) + 1 = 197. [Homewood]
(There are 8 curios for this number that have not yet been approved by an editor.)
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