The number 7091
7091 is a composite number with 4 divisors. Its prime factorisation is 7 × 1013. Divisors (4): 1, 7, 1013, 7091.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 7091: a semiprime: 7 × 1013, the product of two primes.
- 2
7091 is composite. Its prime factorisation is
- 3
The divisors add up to 8112; without 7091 itself that is 1021, so 7091 is deficient (1021 is less than 7091). Euler's totient φ(7091) = 6072 numbers up to 7091 share no factor with it.
- 4
The digits of 7091 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 57 steps to reach 1.
LaTeX source of the formulas on this page
\[ 7091 = 7 \times 1013 \]
7091 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 8112 |
| Euler totient φ(n) | 6072 |
| Square | 50282281 |
| Cube | 356551654571 |
| Square root | 84.208076 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 57 |
| Scientific notation | 7.091 × |
7091 in other forms
| Form | Value |
|---|---|
| In words | seven thousand and ninety-one |
| Binary (base 2) | 1101110110011 |
| Octal (base 8) | 15663 |
| Hexadecimal (base 16) | 1BB3 |
| Base 3 | 100201122 |
| As time | 7091 seconds = 1 h 58 min 11 s |
Is 7091 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 2) | 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 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (7091 ÷ 7 = 1013) | 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 8) | 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 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 7091 a prime number?
No. 7091 = 7 × 1013, so it is divisible by 7.
What are the factors of 7091?
1, 7, 1013, 7091.
What is 7091 in binary?
1101110110011 (hexadecimal 1BB3, octal 15663).
What is the square root of 7091?
About 84.2081.
Is 7091 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 7091?
7091 is a semiprime: 7 × 1013, the product of two primes.