51

51 (fifty-one) is a positive integer following 50 and preceding 52. Its ordinal form is written "fifty-first" or 51st.
== Properties ==
*51 is an .
*51 is also a number.OEIS, Sequence A001358. Accessed 2021-05-19.
== In googology ==
*In Greek-based number-naming systems, 51 is associated with prefix "henpentaconta-", and with prefix "unquinquaginti-" in Latin systems.
*51 is the 7th output of the Xi function, \(\Xi(7) = 51\)
*51 is equal to \(\text{Worm}(2)\) in Beklemishev's worms.
==Sources==
Category:Numbers
Category:Class 1
Category:Non-powers
Category:Numbers 0-99
Category:Numbers with 1 to 2 digits
Category:Odd numbers