61 (number)

← 60 61 62 →
← 60 61 62 63 64 65 66 67 68 69 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	sixty-one
Ordinal	61st (sixty-first)
Factorization	prime
Divisors	1, 61
Roman numeral	LXI
Binary	1111012
Ternary	20213
Quaternary	3314
Quinary	2215
Senary	1416
Octal	758
Duodecimal	5112
Hexadecimal	3D16
Vigesimal	3120
Base 36	1P36

61 (sixty-one) is the natural number following 60 and preceding 62.

61 is:

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).

Sixty-one is:

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