71 (seventy-one) is a positive integer following 70 and preceding 72. Its ordinal form is written "seventy-first" or 71st.

Properties Edit

71 is an odd prime number.

71 is the largest known number whose square is one more than a factorial number.

In googology Edit

In Greek-based number-naming systems, 71 is associated with prefix "henheptaconta-", and with prefix "unseptuaginti-" in Latin systems.

In group theory Edit

It is also the largest prime to appear in the factorization of the order of a sporadic group.