1911 is 11101110111 in base 2 (binary) (A023691), 131313 in base 4 (A037576), and 1133 in base 12 (A033010). It is 876 in base 15 and 777 in base 16 (A033029).
1911 is a hendecadonal number (A051682). It is also a heptagonal pyramidal number (A002413).
1911 divides 793 - 1.
1911 was a year with exactly two "Friday the 13ths" (A190652).
Source: What's Special About This Number?
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