The number 61801
61801 is a composite number with 4 divisors. Its prime factorisation is 23 × 2687. Divisors (4): 1, 23, 2687, 61801.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 61801: a semiprime: 23 × 2687, the product of two primes.
- 2
61801 is composite. Its prime factorisation is
- 3
The divisors add up to 64512; without 61801 itself that is 2711, so 61801 is deficient (2711 is less than 61801). Euler's totient φ(61801) = 59092 numbers up to 61801 share no factor with it.
- 4
The digits of 61801 add up to 16, 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
\[ 61801 = 23 \times 2687 \]
61801 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 64512 |
| Euler totient φ(n) | 59092 |
| Square | 3819363601 |
| Cube | 236040489905401 |
| Square root | 248.598069 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 60 |
| Scientific notation | 6.1801 × |
61801 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand eight hundred and one |
| Binary (base 2) | 1111000101101001 |
| Octal (base 8) | 170551 |
| Hexadecimal (base 16) | F169 |
| Base 3 | 10010202221 |
| As time | 61801 seconds = 17 h 10 min 1 s |
Is 61801 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 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 1) | 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 7) | 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 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 61801 a prime number?
No. 61801 = 23 × 2687, so it is divisible by 23.
What are the factors of 61801?
1, 23, 2687, 61801.
What is 61801 in binary?
1111000101101001 (hexadecimal F169, octal 170551).
What is the square root of 61801?
About 248.5981.
Is 61801 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 61801?
61801 is a semiprime: 23 × 2687, the product of two primes.