The number 31403
31403 is a composite number with 4 divisors. Its prime factorisation is 31 × 1013. Divisors (4): 1, 31, 1013, 31403.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 31403: a semiprime: 31 × 1013, the product of two primes.
- 2
31403 is composite. Its prime factorisation is
- 3
The divisors add up to 32448; without 31403 itself that is 1045, so 31403 is deficient (1045 is less than 31403). Euler's totient φ(31403) = 30360 numbers up to 31403 share no factor with it.
- 4
The digits of 31403 add up to 11, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 59 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31403 = 31 \times 1013 \]
31403 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 32448 |
| Euler totient φ(n) | 30360 |
| Square | 986148409 |
| Cube | 30968018487827 |
| Square root | 177.208916 |
| Digit sum / digital root | 11 / 2 |
| Collatz steps to 1 | 59 |
| Scientific notation | 3.1403 × |
31403 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand four hundred and three |
| Binary (base 2) | 111101010101011 |
| Octal (base 8) | 75253 |
| Hexadecimal (base 16) | 7AAB |
| Base 3 | 1121002002 |
| As time | 31403 seconds = 8 h 43 min 23 s |
Is 31403 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 2) | 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 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | 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 3) | 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 3) | 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 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31403 a prime number?
No. 31403 = 31 × 1013, so it is divisible by 31.
What are the factors of 31403?
1, 31, 1013, 31403.
What is 31403 in binary?
111101010101011 (hexadecimal 7AAB, octal 75253).
What is the square root of 31403?
About 177.2089.
Is 31403 divisible by 3?
No. Its digits add up to 11, which is not a multiple of 3.
What is special about the number 31403?
31403 is a semiprime: 31 × 1013, the product of two primes.