The number 51649
51649 is a composite number with 8 divisors. Its prime factorisation is 13 × 29 × 137. Divisors (8): 1, 13, 29, 137, 377, 1781, 3973, 51649.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
51649 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
51649 is composite. Its prime factorisation is
- 3
The divisors add up to 57960; without 51649 itself that is 6311, so 51649 is deficient (6311 is less than 51649). Euler's totient φ(51649) = 45696 numbers up to 51649 share no factor with it.
- 4
The digits of 51649 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 109 steps to reach 1.
LaTeX source of the formulas on this page
\[ 51649 = 13 \times 29 \times 137 \]
51649 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 57960 |
| Euler totient φ(n) | 45696 |
| Square | 2667619201 |
| Cube | 137779864112449 |
| Square root | 227.264163 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 109 |
| Scientific notation | 5.1649 × |
51649 in other forms
| Form | Value |
|---|---|
| In words | fifty-one thousand six hundred and forty-nine |
| Binary (base 2) | 1100100111000001 |
| Octal (base 8) | 144701 |
| Hexadecimal (base 16) | C9C1 |
| Base 3 | 2121211221 |
| As time | 51649 seconds = 14 h 20 min 49 s |
Is 51649 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 51649 a prime number?
No. 51649 = 13 × 29 × 137, so it is divisible by 13.
What are the factors of 51649?
1, 13, 29, 137, 377, 1781, 3973, 51649.
What is 51649 in binary?
1100100111000001 (hexadecimal C9C1, octal 144701).
What is the square root of 51649?
About 227.2642.
Is 51649 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 51649?
It is a composite number with 8 divisors.