4949 has semiprime digits (A111494).
4949 is a number whose consecutive digits differ by 5 (A048407).
4949 is a composite number that yields a prime whenever a 5 is inserted anywhere except the end (A216167).
4949 is the smallest number that is the sum of four nonnegative cubes in five ways (A076749).
4949 has a representation as a sum of two squares: 4949 = 72 + 702.
4949 has a fourth power that is the sum of four distinct fourth powers (A003294 and A096739).
Source: What's Special About This Number?
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