 | 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.
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:
21 (twenty-one) is the natural number following 20 and preceding 22.
70 (seventy) is the natural number following 69 and preceding 71.
23 (twenty-three) is the natural number following 22 and preceding 24.
79 (seventy-nine) is the natural number following 78 and preceding 80.
31 (thirty-one) is the natural number following 30 and preceding 32. It is a prime number.
37 (thirty-seven) is the natural number following 36 and preceding 38.
114 is the natural number following 113 and preceding 115.
200 is the natural number following 199 and preceding 201.
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.
700 is the natural number following 699 and preceding 701.
600 is the natural number following 599 and preceding 601.
2000 is a natural number following 1999 and preceding 2001.
10,000 is the natural number following 9,999 and preceding 10,001.
7000 is the natural number following 6999 and preceding 7001.
1,000,000, or one thousand thousand, is the natural number following 999,999 and preceding 1,000,001. The word is derived from the early Italian millione, from mille, "thousand", plus the augmentative suffix -one.
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.
10,000,000 is the natural number following 9,999,999 and preceding 10,000,001.
100,000,000 is the natural number following 99,999,999 and preceding 100,000,001.
277 is the natural number following 276 and preceding 278.
