Number
49
- Positive
- Odd
- Composite
- Perfect square
- 2 digits
49 is an odd 2-digit integer and a composite number. It has 3 divisors and a digital root of 4.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value49
Digit count2
Digit sum13
Digital root4repeated digit sum
PalindromicNoreads differently backwards
Perfect squareYes, 7²
Happy numberYessquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation7^2
Distinct prime factors17
Number of divisors3
Sum of divisors σ(n)57
Aliquot sum8sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)42integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 7, 493 in total
Arithmetic
Representations
Decimal49
Binary1100016 bits
Octal61
Hexadecimal31
Base 361D
Roman numeralXLIX
In wordsforty-nine
Ordinalforty-ninth
Scientific notation4.9 × 10^1
Engineering notation49
Nearest landmarks
Powers & multiples
49 to the power 22,401
49 to the power 3117,649
49 to the power 45,764,801
49 to the power 5282,475,249
First ten multiples49, 98, 147, 196, 245, 294, 343, 392, 441, 490
Powers of twoBetween 2^5 (32) and 2^6 (64)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 1
Divisible by 5No, remainder 4
Divisible by 6No, remainder 1
Divisible by 7Yes
Divisible by 8No, remainder 1
Divisible by 9No, remainder 4
Divisible by 10No, remainder 9
Divisible by 11No, remainder 5
Divisible by 12No, remainder 1
Divisible by 100No, remainder 49
Collatz (3n + 1) trajectory
Steps to reach 124the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps49 → 148 → 74 → 37 → 112 → 56 → 28 → 14 → 7 → 22 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage4,900%
49% as a decimal0.49
49% of 10049
49% of 1,000490
As a fraction of 10049/100
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