The number 3291
3291 is a composite number with 4 divisors. Its prime factorisation is 3 × 1097. Divisors (4): 1, 3, 1097, 3291.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 3291: a semiprime: 3 × 1097, the product of two primes.
- 2
3291 is composite. Its prime factorisation is
- 3
The divisors add up to 4392; without 3291 itself that is 1101, so 3291 is deficient (1101 is less than 3291). Euler's totient φ(3291) = 2192 numbers up to 3291 share no factor with it.
- 4
The digits of 3291 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 136 steps to reach 1.
LaTeX source of the formulas on this page
\[ 3291 = 3 \times 1097 \]
3291 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 4392 |
| Euler totient φ(n) | 2192 |
| Square | 10830681 |
| Cube | 35643771171 |
| Square root | 57.367238 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 136 |
| Scientific notation | 3.291 × |
3291 in other forms
| Form | Value |
|---|---|
| In words | three thousand two hundred and ninety-one |
| Roman numerals | MMMCCXCI |
| Binary (base 2) | 110011011011 |
| Octal (base 8) | 6333 |
| Hexadecimal (base 16) | CDB |
| Base 3 | 11111220 |
| As time | 3291 seconds = 54 min 51 s |
Is 3291 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 (3291 ÷ 3 = 1097) | 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 | No (remainder 1) | 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 1) | 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 | No (remainder 6) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | 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 3291 a prime number?
No. 3291 = 3 × 1097, so it is divisible by 3.
What are the factors of 3291?
1, 3, 1097, 3291.
What is 3291 in binary?
110011011011 (hexadecimal CDB, octal 6333).
What is the square root of 3291?
About 57.3672.
What is 3291 in Roman numerals?
MMMCCXCI.
Is 3291 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 3291?
3291 is a semiprime: 3 × 1097, the product of two primes.