The number 25015
25015 is a composite number with 4 divisors. Its prime factorisation is 5 × 5003. Divisors (4): 1, 5, 5003, 25015.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 25015: a semiprime: 5 × 5003, the product of two primes.
- 2
25015 is composite. Its prime factorisation is
- 3
The divisors add up to 30024; without 25015 itself that is 5009, so 25015 is deficient (5009 is less than 25015). Euler's totient φ(25015) = 20008 numbers up to 25015 share no factor with it.
- 4
The digits of 25015 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 113 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25015 = 5 \times 5003 \]
25015 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 30024 |
| Euler totient φ(n) | 20008 |
| Square | 625750225 |
| Cube | 15653141878375 |
| Square root | 158.161310 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 113 |
| Scientific notation | 2.5015 × |
25015 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand and fifteen |
| Binary (base 2) | 110000110110111 |
| Octal (base 8) | 60667 |
| Hexadecimal (base 16) | 61B7 |
| Base 3 | 1021022111 |
| As time | 25015 seconds = 6 h 56 min 55 s |
Is 25015 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (25015 ÷ 5 = 5003) | 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 4) | 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 7) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 25015 a prime number?
No. 25015 = 5 × 5003, so it is divisible by 5.
What are the factors of 25015?
1, 5, 5003, 25015.
What is 25015 in binary?
110000110110111 (hexadecimal 61B7, octal 60667).
What is the square root of 25015?
About 158.1613.
Is 25015 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 25015?
25015 is a semiprime: 5 × 5003, the product of two primes.