71

71 < 70 | 72 >
Numbers 0 - 99
0	1	2	3	4	5	6	7	8	9
10	11	12	13	14	15	16	17	18	19
20	21	22	23	24	25	26	27	28	29
30	31	32	33	34	35	36	37	38	39
40	41	42	43	44	45	46	47	48	49
50	51	52	53	54	55	56	57	58	59
60	61	62	63	64	65	66	67	68	69
70	71	72	73	74	75	76	77	78	79
80	81	82	83	84	85	86	87	88	89
90	91	92	93	94	95	96	97	98	99

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

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 prime to appear in the factorization of the order of a sporadic group.