1534 is 4321 in base 7.
1534 arises in the sequence generated by starting with 1 then successively doubling the number and adding 1 to the result (A083416).
1534 has exactly nine 1s in its binary expansion (A023961).
1534 is the sum of the first 37 primes minus the sum of the first 37 non-primes (A071411).
Source: What's Special About This Number?
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