The number 325
325 is a triangular number: 1 + 2 + ā¦ + 25 = 325 and a binary palindrome (101000101). Its prime factorisation is Ć 13. Divisors (6): 1, 5, 13, 25, 65, 325.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 325: a triangular number: 1 + 2 + ā¦ + 25 = 325; a binary palindrome (101000101).
- 2
325 is composite. Its prime factorisation is
- 3
The divisors add up to 434; without 325 itself that is 109, so 325 is deficient (109 is less than 325). Euler's totient Ļ(325) = 240 numbers up to 325 share no factor with it.
- 4
The digits of 325 add up to 10, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 24 steps to reach 1.
LaTeX source of the formulas on this page
\[ 325 = 5^{2} \times 13 \]325 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 434 |
| Euler totient Ļ(n) | 240 |
| Square | 105625 |
| Cube | 34328125 |
| Square root | 18.027756 (= 5ā13) |
| Digit sum / digital root | 10 / 1 |
| Collatz steps to 1 | 24 |
| Scientific notation | 3.25 Ć |
325 in other forms
| Form | Value |
|---|---|
| In words | three hundred and twenty-five |
| Roman numerals | CCCXXV |
| Binary (base 2) | 101000101 |
| Octal (base 8) | 505 |
| Hexadecimal (base 16) | 145 |
| Base 3 | 110001 |
| As time | 325 seconds = 5 min 25 s |
Is 325 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 | Yes (325 Ć· 5 = 65) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | 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 6) | 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 325 a prime number?
No. 325 = Ć 13, so it is divisible by 5.
What are the factors of 325?
1, 5, 13, 25, 65, 325.
What is 325 in binary?
101000101 (hexadecimal 145, octal 505).
What is the square root of 325?
About 18.0278, exactly 5ā13.
What is 325 in Roman numerals?
CCCXXV.
Is 325 divisible by 3?
No. Its digits add up to 10, which is not a multiple of 3.
What is special about the number 325?
325 is a triangular number: 1 + 2 + ā¦ + 25 = 325; a binary palindrome (101000101).