| ||||
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Cardinal | seventy-one | |||
Ordinal | 71st (seventy-first) | |||
Factorization | prime | |||
Prime | 20th | |||
Divisors | 1, 71 | |||
Greek numeral | ΟΑ´ | |||
Roman numeral | LXXI | |||
Binary | 10001112 | |||
Ternary | 21223 | |||
Senary | 1556 | |||
Octal | 1078 | |||
Duodecimal | 5B12 | |||
Hexadecimal | 4716 |
71 (seventy-one) is the natural number following 70 and preceding 72.
Because both rearrangements of its digits (17 and 71) are prime numbers, 71 is an emirp and more generally a permutable prime. [1] [2] It is the largest number which occurs as a prime factor of an order of a sporadic simple group, the largest (15th) supersingular prime. [3] [4]
It is a Pillai prime, since is divisible by 71, but 71 is not one more than a multiple of 9. [5] It is part of the last known pair (71, 7) of Brown numbers, since . [6]
It is centered heptagonal number. [7]
17 (seventeen) is the natural number following 16 and preceding 18. It is a prime number.
19 (nineteen) is the natural number following 18 and preceding 20. It is a prime number.
79 (seventy-nine) is the natural number following 78 and preceding 80.
73 (seventy-three) is the natural number following 72 and preceding 74. In English, it is the smallest natural number with twelve letters in its spelled out name.
34 (thirty-four) is the natural number following 33 and preceding 35.
31 (thirty-one) is the natural number following 30 and preceding 32. It is a prime number.
57 (fifty-seven) is the natural number following 56 and preceding 58.
1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.
300 is the natural number following 299 and preceding 301.
400 is the natural number following 399 and preceding 401.
700 is the natural number following 699 and preceding 701.
2000 is a natural number following 1999 and preceding 2001.
115 is the natural number following 114 and preceding 116.
3000 is the natural number following 2999 and preceding 3001. It is the smallest number requiring thirteen letters in English.
4000 is the natural number following 3999 and preceding 4001. It is a decagonal number.
7000 is the natural number following 6999 and preceding 7001.
149 is the natural number between 148 and 150.
193 is the natural number following 192 and preceding 194.
233 is the natural number following 232 and preceding 234.
183 is the natural number following 182 and preceding 184.