The number 4121
4121 is a composite number with 4 divisors. Its prime factorisation is 13 × 317. Divisors (4): 1, 13, 317, 4121.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 4121: a semiprime: 13 × 317, the product of two primes.
- 2
4121 is composite. Its prime factorisation is
- 3
The divisors add up to 4452; without 4121 itself that is 331, so 4121 is deficient (331 is less than 4121). Euler's totient φ(4121) = 3792 numbers up to 4121 share no factor with it.
- 4
The digits of 4121 add up to 8, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 64 steps to reach 1.
LaTeX source of the formulas on this page
\[ 4121 = 13 \times 317 \]
4121 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 4452 |
| Euler totient φ(n) | 3792 |
| Square | 16982641 |
| Cube | 69985463561 |
| Square root | 64.195015 |
| Digit sum / digital root | 8 / 8 |
| Collatz steps to 1 | 64 |
| Scientific notation | 4.121 × |
4121 in other forms
| Form | Value |
|---|---|
| In words | four thousand one hundred and twenty-one |
| Binary (base 2) | 1000000011001 |
| Octal (base 8) | 10031 |
| Hexadecimal (base 16) | 1019 |
| Base 3 | 12122122 |
| As time | 4121 seconds = 1 h 8 min 41 s |
Is 4121 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 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 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 7) | 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 4121 a prime number?
No. 4121 = 13 × 317, so it is divisible by 13.
What are the factors of 4121?
1, 13, 317, 4121.
What is 4121 in binary?
1000000011001 (hexadecimal 1019, octal 10031).
What is the square root of 4121?
About 64.1950.
Is 4121 divisible by 3?
No. Its digits add up to 8, which is not a multiple of 3.
What is special about the number 4121?
4121 is a semiprime: 13 × 317, the product of two primes.