The number 71431
71431 is a composite number with 4 divisors. Its prime factorisation is 61 × 1171. Divisors (4): 1, 61, 1171, 71431.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 71431: a semiprime: 61 × 1171, the product of two primes.
- 2
71431 is composite. Its prime factorisation is
- 3
The divisors add up to 72664; without 71431 itself that is 1233, so 71431 is deficient (1233 is less than 71431). Euler's totient φ(71431) = 70200 numbers up to 71431 share no factor with it.
- 4
The digits of 71431 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 125 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71431 = 61 \times 1171 \]
71431 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 72664 |
| Euler totient φ(n) | 70200 |
| Square | 5102387761 |
| Cube | 364468660155991 |
| Square root | 267.265785 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 125 |
| Scientific notation | 7.1431 × |
71431 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand four hundred and thirty-one |
| Binary (base 2) | 10001011100000111 |
| Octal (base 8) | 213407 |
| Hexadecimal (base 16) | 11707 |
| Base 3 | 10121222121 |
| As time | 71431 seconds = 19 h 50 min 31 s |
Is 71431 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 | No (remainder 3) | 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 7) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | 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 8) | 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 71431 a prime number?
No. 71431 = 61 × 1171, so it is divisible by 61.
What are the factors of 71431?
1, 61, 1171, 71431.
What is 71431 in binary?
10001011100000111 (hexadecimal 11707, octal 213407).
What is the square root of 71431?
About 267.2658.
Is 71431 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 71431?
71431 is a semiprime: 61 × 1171, the product of two primes.