The number 87113
87113 is a composite number with 4 divisors. Its prime factorisation is 13 × 6701. Divisors (4): 1, 13, 6701, 87113.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 87113: a semiprime: 13 × 6701, the product of two primes.
- 2
87113 is composite. Its prime factorisation is
- 3
The divisors add up to 93828; without 87113 itself that is 6715, so 87113 is deficient (6715 is less than 87113). Euler's totient φ(87113) = 80400 numbers up to 87113 share no factor with it.
- 4
The digits of 87113 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 71 steps to reach 1.
LaTeX source of the formulas on this page
\[ 87113 = 13 \times 6701 \]
87113 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 93828 |
| Euler totient φ(n) | 80400 |
| Square | 7588674769 |
| Cube | 661072225151897 |
| Square root | 295.149115 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 71 |
| Scientific notation | 8.7113 × |
87113 in other forms
| Form | Value |
|---|---|
| In words | eighty-seven thousand one hundred and thirteen |
| Binary (base 2) | 10101010001001001 |
| Octal (base 8) | 252111 |
| Hexadecimal (base 16) | 15449 |
| Base 3 | 11102111102 |
| As time | 87113 seconds = 24 h 11 min 53 s |
Is 87113 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | 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 | No (remainder 5) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 3) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 87113 a prime number?
No. 87113 = 13 × 6701, so it is divisible by 13.
What are the factors of 87113?
1, 13, 6701, 87113.
What is 87113 in binary?
10101010001001001 (hexadecimal 15449, octal 252111).
What is the square root of 87113?
About 295.1491.
Is 87113 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 87113?
87113 is a semiprime: 13 × 6701, the product of two primes.