31 in Spanish
Nearby Spanish Numbers
31 in Other Languages
About 31 in Spanish
In Spanish, 31 is written and spoken as treinta y uno. The ordinal form — used for rankings, dates, and sequences — is trigésimo primero.
In mathematics, 31 is odd and prime. You'll encounter 31 in Spanish in many practical contexts: shopping, transportation, appointments, and everyday small talk.
Building fluency with numbers like 31 in Spanish pays dividends quickly. Numbers are among the first things you use in a new language — for shopping, directions, introductions, and understanding announcements.
Learning Numbers in Spanish
What makes Spanish numbers challenging
Spanish numbers 0-15 are unique words requiring pure memorization. The contraction pattern changes at 16 (dieciséis) and again at 21 (veintiuno) and 31 (treinta y uno), creating three different combination styles. Phone numbers can be read in groups of varying size — digit-by-digit, pairs, or triples — and the style varies by speaker and country. The long scale in most Spanish-speaking countries means un billón = 1 trillion, a major trap in financial contexts. Regional pronunciation varies widely between Spain and Latin America.
Tips for learning Spanish numbers
Memorize 0-15 as a block, then learn the combining patterns for 16-19, 21-29, and 31+. Once you master these three patterns, the system is completely predictable. Practice with prices in euros or pesos for the most common real-world number encounters. For phone numbers, train with both digit-by-digit and group styles since speakers vary. Spanish number words are mostly transparent — cuarenta y cinco (45) literally means "forty and five" — making them intuitive once the base words are learned.