The number 61361
61361 is a composite number with 4 divisors. Its prime factorisation is 43 × 1427. Divisors (4): 1, 43, 1427, 61361.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 61361: a semiprime: 43 × 1427, the product of two primes.
- 2
61361 is composite. Its prime factorisation is
- 3
The divisors add up to 62832; without 61361 itself that is 1471, so 61361 is deficient (1471 is less than 61361). Euler's totient φ(61361) = 59892 numbers up to 61361 share no factor with it.
- 4
The digits of 61361 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 60 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61361 = 43 \times 1427 \]
61361 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 62832 |
| Euler totient φ(n) | 59892 |
| Square | 3765172321 |
| Cube | 231034738788881 |
| Square root | 247.711526 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 60 |
| Scientific notation | 6.1361 × |
61361 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand three hundred and sixty-one |
| Binary (base 2) | 1110111110110001 |
| Octal (base 8) | 167661 |
| Hexadecimal (base 16) | EFB1 |
| Base 3 | 10010011122 |
| As time | 61361 seconds = 17 h 2 min 41 s |
Is 61361 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 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 | No (remainder 6) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | 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 61361 a prime number?
No. 61361 = 43 × 1427, so it is divisible by 43.
What are the factors of 61361?
1, 43, 1427, 61361.
What is 61361 in binary?
1110111110110001 (hexadecimal EFB1, octal 167661).
What is the square root of 61361?
About 247.7115.
Is 61361 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 61361?
61361 is a semiprime: 43 × 1427, the product of two primes.