Roman Numerals / 31

31 in Roman Numerals

XXXI

31 = XXX (10), I (1). That's XXXI, purely additive. 31 splits into 3 tens (XXX), 1 (I), together forming XXXI. One below 31 is XXX (30); one above is XXXII (32). XXXI hits the 3-repeat cap with XXX, for 31. 31: 2 Arabic digits, 4 Roman symbols, for 31. In binary, 31 is 11111, 5 bits long for 31.