The number 42931
42931 is a composite number with 4 divisors. Its prime factorisation is 7 × 6133. Divisors (4): 1, 7, 6133, 42931.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42931: a semiprime: 7 × 6133, the product of two primes.
- 2
42931 is composite. Its prime factorisation is
- 3
The divisors add up to 49072; without 42931 itself that is 6141, so 42931 is deficient (6141 is less than 42931). Euler's totient φ(42931) = 36792 numbers up to 42931 share no factor with it.
- 4
The digits of 42931 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42931 = 7 \times 6133 \]
42931 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 49072 |
| Euler totient φ(n) | 36792 |
| Square | 1843070761 |
| Cube | 79124870840491 |
| Square root | 207.197973 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 75 |
| Scientific notation | 4.2931 × |
42931 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand nine hundred and thirty-one |
| Binary (base 2) | 1010011110110011 |
| Octal (base 8) | 123663 |
| Hexadecimal (base 16) | A7B3 |
| Base 3 | 2011220001 |
| As time | 42931 seconds = 11 h 55 min 31 s |
Is 42931 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 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (42931 ÷ 7 = 6133) | 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 3) | 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 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42931 a prime number?
No. 42931 = 7 × 6133, so it is divisible by 7.
What are the factors of 42931?
1, 7, 6133, 42931.
What is 42931 in binary?
1010011110110011 (hexadecimal A7B3, octal 123663).
What is the square root of 42931?
About 207.1980.
Is 42931 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 42931?
42931 is a semiprime: 7 × 6133, the product of two primes.