This number is a composite.

+ 124 is the smallest number whose sum of digits as well as the number itself are one less than the cube of a prime. [Gupta]

+ The sum of the 3rd to (2*5)th prime numbers (5 + 7 + ... + 29 = 124). [Thoms]

+ 124 = sigma(1!*2!*4!). Note that 124 is the smallest multi-digit number with this property. [Firoozbakht]

+ The concatenation of 1^124, 2^124, 3^124, 4^124, 5^124, 6^124, and 7^124 in order is a 463-digit prime number. [Gaydos]

+ Smallest positive integer k such that k*p+1 cannot be a perfect power if p is prime. [Xayah]

(There is one curio for this number that has not yet been approved by an editor.)

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