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* The number of points required to win a "standard" game of ]<ref>Hoyle, Edmund ''Hoyle's Official Rules of Card Games'' pub. Gary Allen Pty Ltd, (2004) p. 470</ref>
* The number of points required to win a "standard" game of ]<ref>Hoyle, Edmund ''Hoyle's Official Rules of Card Games'' pub. Gary Allen Pty Ltd, (2004) p. 470</ref>
* The maximum number of tables that can be joined in a single ] or ] query<ref></ref>
* The maximum number of tables that can be joined in a single ] or ] query<ref></ref>
* I hear it's amazing when the purple-stuffed worm in flap jaw space, with the tuning fork, does a raw blink on Hari-Kari Rock. I need scissors! 61!
a cuban prime of the form p = x − y/x − y, where x = y + 1.
the smallest proper prime, a prime p which ends in the digit 1 in base 10 and whose reciprocal in base 10 has a repeating sequence with length p − 1. In such primes, each digit 0, 1, ..., 9 appears in the repeating sequence the same number of times as does each other digit (namely, p − 1/10 times).
the 9th Mersenne prime exponent. (2 − 1 = 2,305,843,009,213,693,951)
a unique prime in base 14, since no other prime has a 6-digit period in base 14.
a Pillai prime since 8! + 1 is divisible by 61 but 61 is not one more than a multiple of 8.
a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 6, 1, 7, 8, 15, 23, 38, 61...
palindromic in bases 6 (1416) and 60 (1160)
In the list of Fortunate numbers, 61 occurs thrice, since adding 61 to either the tenth, twelfth or seventeenth primorial gives a prime number (namely 6,469,693,291; 7,420,738,134,871; and 1,922,760,350,154,212,639,131).
In science
The chemical element with the atomic number 61 (promethium), a lanthanide, is the element with the secondary lowest ordinal number that does not possess any stable isotopes. The promethium preceding element with atomic number 60 (neodymium) and the promethium following element 62 (samarium) have all stable isotopes.
U.S. Route 61 is the highway that inspired so much attention on "Highway 61"
Part 61 is a law created by the FAA regarding medical exams. This law has often come under attack by AOPA.
The P-61 is the Northrop designed fighter first designated as the XP-61. It first flew on May 26, 1942. It is also known as the Black Widow as it was the first fighter aircraft designed to be a night fighter
Sixty 1 brand tobacco produced by Nationwide Tobacco