The number 31126
31126 is a composite number with 8 divisors. Its prime factorisation is 2 × 79 × 197. Divisors (8): 1, 2, 79, 158, 197, 394, 15563, 31126.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31126 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31126 is composite. Its prime factorisation is
- 3
The divisors add up to 47520; without 31126 itself that is 16394, so 31126 is deficient (16394 is less than 31126). Euler's totient φ(31126) = 15288 numbers up to 31126 share no factor with it.
- 4
The digits of 31126 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 85 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31126 = 2 \times 79 \times 197 \]
31126 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 47520 |
| Euler totient φ(n) | 15288 |
| Square | 968827876 |
| Cube | 30155736468376 |
| Square root | 176.425622 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 85 |
| Scientific notation | 3.1126 × |
31126 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand one hundred and twenty-six |
| Binary (base 2) | 111100110010110 |
| Octal (base 8) | 74626 |
| Hexadecimal (base 16) | 7996 |
| Base 3 | 1120200211 |
| As time | 31126 seconds = 8 h 38 min 46 s |
Is 31126 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (31126 ÷ 2 = 15563) | 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 2) | 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 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 6) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31126 a prime number?
No. 31126 = 2 × 79 × 197, so it is divisible by 2.
What are the factors of 31126?
1, 2, 79, 158, 197, 394, 15563, 31126.
What is 31126 in binary?
111100110010110 (hexadecimal 7996, octal 74626).
What is the square root of 31126?
About 176.4256.
Is 31126 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 31126?
It is a composite number with 8 divisors.