123 (one hundred [and] twenty-three) is the natural number following 122 and preceding 124.
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In mathematics
123 is a Lucas number. It is the eleventh member of the Mian–Chowla sequence.
Along with 6, 123 is one of only two positive integers that is simultaneously two more than a perfect square and two less than a perfect cube (123 = 112 + 2 = 53 - 2).
In religion
In numerology, the sequence of 123 is associated with progress and the Holy Trinity, so it may be referred to as the Trinity of Progress or Triad of Progress.