 | This article needs additional citations for verification .(May 2016) |
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|---|---|---|---|---|
| Cardinal | forty-nine | |||
| Ordinal | 49th (forty-ninth) | |||
| Factorization | 72 | |||
| Divisors | 1, 7, 49 | |||
| Greek numeral | ΜΘ´ | |||
| Roman numeral | XLIX | |||
| Binary | 1100012 | |||
| Ternary | 12113 | |||
| Senary | 1216 | |||
| Octal | 618 | |||
| Duodecimal | 4112 | |||
| Hexadecimal | 3116 | |||
49 (forty-nine) is the natural number following 48 and preceding 50.
Forty-nine is the square of the prime number seven and hence the fourth non-unitary square prime of the form p2
49 has an aliquot sum of 8; itself a prime power, and hence an aliquot sequence of two composite members (49, 8, 7,1,0).
It appears in the Padovan sequence, preceded by the terms 21, 28, 37 (it is the sum of the first two of these). [1]
Along with the number that immediately derives from it, 77, the only number under 100 not having its home prime known (as of 2016 [update] ).
The smallest triple of three squares in arithmetic succession is (1,25,49), and the second smallest is (49,169,289).
49 is the smallest discriminant of a totally real cubic field. [2]
49 and 94 are the only numbers below 100 whose all permutations are composites but they are not multiples of 3, repdigits or numbers which only have digits 0, 2, 4, 5, 6 and 8, even excluding the trivial one digit terms.
49 = 7^2 and 94 = 2 * 47
The number of prime knots with 9 crossings is 49. [3]
The sum of the digits of the square of 49 (2401) is the square root of 49.
49 is the first square where the digits are squares. In this case, 4 and 9 are squares.
The fraction 1/49 is a repeating decimal with a period of 42:
There are 42 positive integers less than 49 and coprime to 49. (42 is the period.) Multiplying 020408163265306122448979591836734693877551 by each of these integers results in a cyclic permutation of the original number:
The repeating number can be obtained from 02 and repetition of doubles placed at two places to the right:
02 04 08 16 32 64 128 256 512 1024 2048 + ... ---------------------- 020408163265306122448979591836734693877551...0204081632...
because 1⁄49 satisfies:
Forty-nine is:
2 (two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and the only even prime number.
15 (fifteen) is the natural number following 14 and preceding 16.
21 (twenty-one) is the natural number following 20 and preceding 22.
45 (forty-five) is the natural number following 44 and preceding 46.
70 (seventy) is the natural number following 69 and preceding 71.
25 (twenty-five) is the natural number following 24 and preceding 26.
28 (twenty-eight) is the natural number following 27 and preceding 29.
81 (eighty-one) is the natural number following 80 and preceding 82.
86 (eighty-six) is the natural number following 85 and preceding 87.
79 (seventy-nine) is the natural number following 78 and preceding 80.
37 (thirty-seven) is the natural number following 36 and preceding 38.
58 (fifty-eight) is the natural number following 57 and preceding 59.
62 (sixty-two) is the natural number following 61 and preceding 63.
64 (sixty-four) is the natural number following 63 and preceding 65.
65 (sixty-five) is the natural number following 64 and preceding 66.
114 is the natural number following 113 and preceding 115.
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.
1,000,000,000 is the natural number following 999,999,999 and preceding 1,000,000,001. With a number, "billion" can be abbreviated as b, bil or bn.
277 is the natural number following 276 and preceding 278.
