The number 25249
25249 is a composite number with 4 divisors. Its prime factorisation is 7 × 3607. Divisors (4): 1, 7, 3607, 25249.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 25249: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 7 × 3607, the product of two primes.
- 2
25249 is composite. Its prime factorisation is
- 3
The divisors add up to 28864; without 25249 itself that is 3615, so 25249 is deficient (3615 is less than 25249). Euler's totient φ(25249) = 21636 numbers up to 25249 share no factor with it.
- 4
The digits of 25249 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 64 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25249 = 7 \times 3607 \]
25249 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 28864 |
| Euler totient φ(n) | 21636 |
| Square | 637512001 |
| Cube | 16096540513249 |
| Square root | 158.899339 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 64 |
| Scientific notation | 2.5249 × |
25249 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand two hundred and forty-nine |
| Binary (base 2) | 110001010100001 |
| Octal (base 8) | 61241 |
| Hexadecimal (base 16) | 62A1 |
| Base 3 | 1021122011 |
| As time | 25249 seconds = 7 h 0 min 49 s |
Is 25249 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 | Yes (25249 ÷ 7 = 3607) | 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 4) | 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 25249 a prime number?
No. 25249 = 7 × 3607, so it is divisible by 7.
What are the factors of 25249?
1, 7, 3607, 25249.
What is 25249 in binary?
110001010100001 (hexadecimal 62A1, octal 61241).
What is the square root of 25249?
About 158.8993.
Is 25249 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 25249?
25249 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 7 × 3607, the product of two primes.