The number 4031
4031 is a composite number with 4 divisors. Its prime factorisation is 29 × 139. Divisors (4): 1, 29, 139, 4031.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 4031: a semiprime: 29 × 139, the product of two primes.
- 2
4031 is composite. Its prime factorisation is
- 3
The divisors add up to 4200; without 4031 itself that is 169, so 4031 is deficient (169 is less than 4031). Euler's totient φ(4031) = 3864 numbers up to 4031 share no factor with it.
- 4
The digits of 4031 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 95 steps to reach 1.
LaTeX source of the formulas on this page
\[ 4031 = 29 \times 139 \]
4031 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 4200 |
| Euler totient φ(n) | 3864 |
| Square | 16248961 |
| Cube | 65499561791 |
| Square root | 63.490157 |
| Digit sum / digital root | 8 / 8 |
| Collatz steps to 1 | 95 |
| Scientific notation | 4.031 × |
4031 in other forms
| Form | Value |
|---|---|
| In words | four thousand and thirty-one |
| Binary (base 2) | 111110111111 |
| Octal (base 8) | 7677 |
| Hexadecimal (base 16) | FBF |
| Base 3 | 12112022 |
| As time | 4031 seconds = 1 h 7 min 11 s |
Is 4031 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 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 7) | 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 5) | 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 4031 a prime number?
No. 4031 = 29 × 139, so it is divisible by 29.
What are the factors of 4031?
1, 29, 139, 4031.
What is 4031 in binary?
111110111111 (hexadecimal FBF, octal 7677).
What is the square root of 4031?
About 63.4902.
Is 4031 divisible by 3?
No. Its digits add up to 8, which is not a multiple of 3.
What is special about the number 4031?
4031 is a semiprime: 29 × 139, the product of two primes.