XXX is three tens and I is one, so XXXI is 31
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31 in Roman numerals is represented as "XXXI".
XXXI represents the number 31 in Roman numerals.
31-03-1987 in roman numerals are XXXI-III-MDCCCCLXXXVII or XXXI-III-VXMMII.
XXXI is the number 31 in Roman numerals.
31.12.12 in Roman numerals is XXXI . XII . XII