The number 51425
51425 is a composite number with 18 divisors. Its prime factorisation is × × 17. Divisors (18): 1, 5, 11, 17, 25, 55, 85, 121, 187, 275, 425, 605, 935, 2057, 3025, 4675 … 51425.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 51425: a Harshad number: divisible by its digit sum 17.
- 2
51425 is composite. Its prime factorisation is
- 3
The divisors add up to 74214; without 51425 itself that is 22789, so 51425 is deficient (22789 is less than 51425). Euler's totient φ(51425) = 35200 numbers up to 51425 share no factor with it.
- 4
The digits of 51425 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 83 steps to reach 1.
LaTeX source of the formulas on this page
\[ 51425 = 5^{2} \times 11^{2} \times 17 \]51425 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 18 |
| Sum of divisors | 74214 |
| Euler totient φ(n) | 35200 |
| Square | 2644530625 |
| Cube | 135994987390625 |
| Square root | 226.770809 (= 55√17) |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 83 |
| Scientific notation | 5.1425 × |
51425 in other forms
| Form | Value |
|---|---|
| In words | fifty-one thousand four hundred and twenty-five |
| Binary (base 2) | 1100100011100001 |
| Octal (base 8) | 144341 |
| Hexadecimal (base 16) | C8E1 |
| Base 3 | 2121112122 |
| As time | 51425 seconds = 14 h 17 min 5 s |
Is 51425 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 2) | 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 | Yes (51425 ÷ 5 = 10285) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | 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 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (51425 ÷ 11 = 4675) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 51425 a prime number?
No. 51425 = × × 17, so it is divisible by 5.
What are the factors of 51425?
1, 5, 11, 17, 25, 55, 85, 121, 187, 275, 425, 605, 935, 2057, 3025, 4675, 10285, 51425.
What is 51425 in binary?
1100100011100001 (hexadecimal C8E1, octal 144341).
What is the square root of 51425?
About 226.7708, exactly 55√17.
Is 51425 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 51425?
51425 is a Harshad number: divisible by its digit sum 17.