The number 71042
71042 is a composite number with 4 divisors. Its prime factorisation is 2 × 35521. Divisors (4): 1, 2, 35521, 71042.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 71042: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 35521, the product of two primes.
- 2
71042 is composite. Its prime factorisation is
- 3
The divisors add up to 106566; without 71042 itself that is 35524, so 71042 is deficient (35524 is less than 71042). Euler's totient φ(71042) = 35520 numbers up to 71042 share no factor with it.
- 4
The digits of 71042 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 99 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71042 = 2 \times 35521 \]
71042 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 106566 |
| Euler totient φ(n) | 35520 |
| Square | 5046965764 |
| Cube | 358546541806088 |
| Square root | 266.537052 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 99 |
| Scientific notation | 7.1042 × |
71042 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand and forty-two |
| Binary (base 2) | 10001010110000010 |
| Octal (base 8) | 212602 |
| Hexadecimal (base 16) | 11582 |
| Base 3 | 10121110012 |
| As time | 71042 seconds = 19 h 44 min 2 s |
Is 71042 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (71042 ÷ 2 = 35521) | 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 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | 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 4) | 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 71042 a prime number?
No. 71042 = 2 × 35521, so it is divisible by 2.
What are the factors of 71042?
1, 2, 35521, 71042.
What is 71042 in binary?
10001010110000010 (hexadecimal 11582, octal 212602).
What is the square root of 71042?
About 266.5371.
Is 71042 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 71042?
71042 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 35521, the product of two primes.