71

71 (seventy-one) is a positive integer following 70 and preceding 72. Its ordinal form is written "seventy-first" or 71st.
== Properties ==
*71 is an .
*71 is the largest known number whose square is one more than a factorial numberOEIS, Sequence A085692 (accessed 2021-02-11).
== In googology ==
In Greek-based number-naming systems, 71 is associated with prefix "henheptaconta-", and with prefix "unseptuaginti-" in Latin systems.
== In group theory ==
It is also the largest to appear in the of the of a .
==Sources==
Category:Numbers
Category:Class 1
Category:Numbers 0-99
Category:Numbers in group theory
Category:Numbers with 1 to 2 digits
Category:Prime numbers