The number 87137
87137 is a composite number with 4 divisors. Its prime factorisation is 79 × 1103. Divisors (4): 1, 79, 1103, 87137.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 87137: a semiprime: 79 × 1103, the product of two primes.
- 2
87137 is composite. Its prime factorisation is
- 3
The divisors add up to 88320; without 87137 itself that is 1183, so 87137 is deficient (1183 is less than 87137). Euler's totient φ(87137) = 85956 numbers up to 87137 share no factor with it.
- 4
The digits of 87137 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 71 steps to reach 1.
LaTeX source of the formulas on this page
\[ 87137 = 79 \times 1103 \]
87137 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 88320 |
| Euler totient φ(n) | 85956 |
| Square | 7592856769 |
| Cube | 661618760280353 |
| Square root | 295.189769 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 71 |
| Scientific notation | 8.7137 × |
87137 in other forms
| Form | Value |
|---|---|
| In words | eighty-seven thousand one hundred and thirty-seven |
| Binary (base 2) | 10101010001100001 |
| Octal (base 8) | 252141 |
| Hexadecimal (base 16) | 15461 |
| Base 3 | 11102112022 |
| As time | 87137 seconds = 24 h 12 min 17 s |
Is 87137 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 2) | 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 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 1) | 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 7) | 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 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 87137 a prime number?
No. 87137 = 79 × 1103, so it is divisible by 79.
What are the factors of 87137?
1, 79, 1103, 87137.
What is 87137 in binary?
10101010001100001 (hexadecimal 15461, octal 252141).
What is the square root of 87137?
About 295.1898.
Is 87137 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 87137?
87137 is a semiprime: 79 × 1103, the product of two primes.