The number 61021
61021 is a composite number with 4 divisors. Its prime factorisation is 139 × 439. Divisors (4): 1, 139, 439, 61021.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 61021: a semiprime: 139 × 439, the product of two primes.
- 2
61021 is composite. Its prime factorisation is
- 3
The divisors add up to 61600; without 61021 itself that is 579, so 61021 is deficient (579 is less than 61021). Euler's totient φ(61021) = 60444 numbers up to 61021 share no factor with it.
- 4
The digits of 61021 add up to 10, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 86 steps to reach 1.
LaTeX source of the formulas on this page
\[ 61021 = 139 \times 439 \]
61021 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 61600 |
| Euler totient φ(n) | 60444 |
| Square | 3723562441 |
| Cube | 227215503712261 |
| Square root | 247.024290 |
| Digit sum / digital root | 10 / 1 |
| Collatz steps to 1 | 86 |
| Scientific notation | 6.1021 × |
61021 in other forms
| Form | Value |
|---|---|
| In words | sixty-one thousand and twenty-one |
| Binary (base 2) | 1110111001011101 |
| Octal (base 8) | 167135 |
| Hexadecimal (base 16) | EE5D |
| Base 3 | 10002201001 |
| As time | 61021 seconds = 16 h 57 min 1 s |
Is 61021 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 2) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | 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 4) | 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 61021 a prime number?
No. 61021 = 139 × 439, so it is divisible by 139.
What are the factors of 61021?
1, 139, 439, 61021.
What is 61021 in binary?
1110111001011101 (hexadecimal EE5D, octal 167135).
What is the square root of 61021?
About 247.0243.
Is 61021 divisible by 3?
No. Its digits add up to 10, which is not a multiple of 3.
What is special about the number 61021?
61021 is a semiprime: 139 × 439, the product of two primes.