The number 85142
85142 is a composite number with 4 divisors. Its prime factorisation is 2 × 42571. Divisors (4): 1, 2, 42571, 85142.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 85142: a semiprime: 2 × 42571, the product of two primes.
- 2
85142 is composite. Its prime factorisation is
- 3
The divisors add up to 127716; without 85142 itself that is 42574, so 85142 is deficient (42574 is less than 85142). Euler's totient φ(85142) = 42570 numbers up to 85142 share no factor with it.
- 4
The digits of 85142 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 58 steps to reach 1.
LaTeX source of the formulas on this page
\[ 85142 = 2 \times 42571 \]
85142 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 127716 |
| Euler totient φ(n) | 42570 |
| Square | 7249160164 |
| Cube | 617207994683288 |
| Square root | 291.791021 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 58 |
| Scientific notation | 8.5142 × |
85142 in other forms
| Form | Value |
|---|---|
| In words | eighty-five thousand one hundred and forty-two |
| Binary (base 2) | 10100110010010110 |
| Octal (base 8) | 246226 |
| Hexadecimal (base 16) | 14C96 |
| Base 3 | 11022210102 |
| As time | 85142 seconds = 23 h 39 min 2 s |
Is 85142 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (85142 ÷ 2 = 42571) | 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 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 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 2) | 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 2) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 85142 a prime number?
No. 85142 = 2 × 42571, so it is divisible by 2.
What are the factors of 85142?
1, 2, 42571, 85142.
What is 85142 in binary?
10100110010010110 (hexadecimal 14C96, octal 246226).
What is the square root of 85142?
About 291.7910.
Is 85142 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 85142?
85142 is a semiprime: 2 × 42571, the product of two primes.