The number 31162
31162 is a composite number with 4 divisors. Its prime factorisation is 2 × 15581. Divisors (4): 1, 2, 15581, 31162.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 31162: a semiprime: 2 × 15581, the product of two primes.
- 2
31162 is composite. Its prime factorisation is
- 3
The divisors add up to 46746; without 31162 itself that is 15584, so 31162 is deficient (15584 is less than 31162). Euler's totient φ(31162) = 15580 numbers up to 31162 share no factor with it.
- 4
The digits of 31162 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
\[ 31162 = 2 \times 15581 \]
31162 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 46746 |
| Euler totient φ(n) | 15580 |
| Square | 971070244 |
| Cube | 30260490943528 |
| Square root | 176.527618 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 85 |
| Scientific notation | 3.1162 × |
31162 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand one hundred and sixty-two |
| Binary (base 2) | 111100110111010 |
| Octal (base 8) | 74672 |
| Hexadecimal (base 16) | 79BA |
| Base 3 | 1120202011 |
| As time | 31162 seconds = 8 h 39 min 22 s |
Is 31162 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (31162 ÷ 2 = 15581) | 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 2) | 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 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 2) | 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 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 31162 a prime number?
No. 31162 = 2 × 15581, so it is divisible by 2.
What are the factors of 31162?
1, 2, 15581, 31162.
What is 31162 in binary?
111100110111010 (hexadecimal 79BA, octal 74672).
What is the square root of 31162?
About 176.5276.
Is 31162 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 31162?
31162 is a semiprime: 2 × 15581, the product of two primes.