947 is a prime number. The difference between any two of its digits is also a prime.
947 is a Chen prime because 947 + 2 = 949 = 13 x 73, so 949 is a semiprime.
947 is the maximum number of regions into which 43 lines divide the plane.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgVABZilg9Of6YqmyAwD5LD1xUkE0lV_OUaPx7aX9nz06v5KEhTZHUuJ7zVOq6X5XbDC_c1gBc0o0FOOd1AX2K4w3oOJBVkzjtIY8BQhtXExB1uuG8fWSAmdVfaaXViWYh__WN-VyKyr2o/s200/n0947.jpg)
Source: Prime Curios!
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