The number 25155
25155 is a composite number with 24 divisors. Its prime factorisation is × 5 × 13 × 43. Divisors (24): 1, 3, 5, 9, 13, 15, 39, 43, 45, 65, 117, 129, 195, 215, 387, 559 … 25155.
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How to work it out
- 1
25155 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
25155 is composite. Its prime factorisation is
- 3
The divisors add up to 48048; without 25155 itself that is 22893, so 25155 is deficient (22893 is less than 25155). Euler's totient φ(25155) = 12096 numbers up to 25155 share no factor with it.
- 4
The digits of 25155 add up to 18, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 38 steps to reach 1.
LaTeX source of the formulas on this page
\[ 25155 = 3^{2} \times 5 \times 13 \times 43 \]25155 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 24 |
| Sum of divisors | 48048 |
| Euler totient φ(n) | 12096 |
| Square | 632774025 |
| Cube | 15917430598875 |
| Square root | 158.603279 (= 3√2795) |
| Digit sum / digital root | 18 / 9 |
| Collatz steps to 1 | 38 |
| Scientific notation | 2.5155 × |
25155 in other forms
| Form | Value |
|---|---|
| In words | twenty-five thousand one hundred and fifty-five |
| Binary (base 2) | 110001001000011 |
| Octal (base 8) | 61103 |
| Hexadecimal (base 16) | 6243 |
| Base 3 | 1021111200 |
| As time | 25155 seconds = 6 h 59 min 15 s |
Is 25155 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 | Yes (25155 ÷ 3 = 8385) | 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 (25155 ÷ 5 = 5031) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (25155 ÷ 9 = 2795) | 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 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 25155 a prime number?
No. 25155 = × 5 × 13 × 43, so it is divisible by 3.
What are the factors of 25155?
1, 3, 5, 9, 13, 15, 39, 43, 45, 65, 117, 129, 195, 215, 387, 559, 585, 645, 1677, 1935, 2795, 5031, 8385, 25155.
What is 25155 in binary?
110001001000011 (hexadecimal 6243, octal 61103).
What is the square root of 25155?
About 158.6033, exactly 3√2795.
Is 25155 divisible by 3?
Yes. Its digits add up to 18, a multiple of 3.
What is special about the number 25155?
It is a composite number with 24 divisors.