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Single Curio View: (Seek other curios for this number) 340561 = 13 x 17 x 23 x 67 is the 2nd 4Brilliant 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]
Submitted: 20041105 10:31:29; Last Modified: 20080130 11:28:00.
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