The number 61387
61387 is a composite number with 8 divisors. Its prime factorisation is 17 × 23 × 157. Divisors (8): 1, 17, 23, 157, 391, 2669, 3611, 61387.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
61387 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
61387 is composite. Its prime factorisation is
- 3
The divisors add up to 68256; without 61387 itself that is 6869, so 61387 is deficient (6869 is less than 61387). Euler's totient φ(61387) = 54912 numbers up to 61387 share no factor with it.
- 4
The digits of 61387 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 60 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61387 = 17 \times 23 \times 157 \]
61387 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 68256 |
| Euler totient φ(n) | 54912 |
| Square | 3768363769 |
| Cube | 231328546687603 |
| Square root | 247.764001 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 60 |
| Scientific notation | 6.1387 × |
61387 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand three hundred and eighty-seven |
| Binary (base 2) | 1110111111001011 |
| Octal (base 8) | 167713 |
| Hexadecimal (base 16) | EFCB |
| Base 3 | 10010012121 |
| As time | 61387 seconds = 17 h 3 min 7 s |
Is 61387 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 3) | 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 7) | 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 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 61387 a prime number?
No. 61387 = 17 × 23 × 157, so it is divisible by 17.
What are the factors of 61387?
1, 17, 23, 157, 391, 2669, 3611, 61387.
What is 61387 in binary?
1110111111001011 (hexadecimal EFCB, octal 167713).
What is the square root of 61387?
About 247.7640.
Is 61387 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 61387?
It is a composite number with 8 divisors.