The book is now available! 340561
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ 340561 = 13 x 17 x 23 x 67 is the 2nd 4-Brilliant Carmichael Number (the first being 75361), and the first Carmichael Number that truncates to another Carmichael Number (to the first, 561). Its reversal is semiprime. Its digital sum (19) is prime. The sum of prime factors is 120 = 5! = 2^3 x 3 x 5, hence the mean of the prime factors is the primorial 30 = 2 x 3 x 5. [Carmichael]

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