The number 61439
61439 is a composite number with 8 divisors. Its prime factorisation is 7 × 67 × 131. Divisors (8): 1, 7, 67, 131, 469, 917, 8777, 61439.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
61439 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
61439 is composite. Its prime factorisation is
- 3
The divisors add up to 71808; without 61439 itself that is 10369, so 61439 is deficient (10369 is less than 61439). Euler's totient φ(61439) = 51480 numbers up to 61439 share no factor with it.
- 4
The digits of 61439 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 285 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61439 = 7 \times 67 \times 131 \]
61439 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 71808 |
| Euler totient φ(n) | 51480 |
| Square | 3774750721 |
| Cube | 231916909547519 |
| Square root | 247.868917 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 285 |
| Scientific notation | 6.1439 × |
61439 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand four hundred and thirty-nine |
| Binary (base 2) | 1110111111111111 |
| Octal (base 8) | 167777 |
| Hexadecimal (base 16) | EFFF |
| Base 3 | 10010021112 |
| As time | 61439 seconds = 17 h 3 min 59 s |
Is 61439 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 4) | 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 (61439 ÷ 7 = 8777) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | 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 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 61439 a prime number?
No. 61439 = 7 × 67 × 131, so it is divisible by 7.
What are the factors of 61439?
1, 7, 67, 131, 469, 917, 8777, 61439.
What is 61439 in binary?
1110111111111111 (hexadecimal EFFF, octal 167777).
What is the square root of 61439?
About 247.8689.
Is 61439 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 61439?
It is a composite number with 8 divisors.