The number 16431
16431 is a composite number with 4 divisors. Its prime factorisation is 3 × 5477. Divisors (4): 1, 3, 5477, 16431.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 16431: a semiprime: 3 × 5477, the product of two primes.
- 2
16431 is composite. Its prime factorisation is
- 3
The divisors add up to 21912; without 16431 itself that is 5481, so 16431 is deficient (5481 is less than 16431). Euler's totient φ(16431) = 10952 numbers up to 16431 share no factor with it.
- 4
The digits of 16431 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 221 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16431 = 3 \times 5477 \]
16431 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 21912 |
| Euler totient φ(n) | 10952 |
| Square | 269977761 |
| Cube | 4436004590991 |
| Square root | 128.183462 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 221 |
| Scientific notation | 1.6431 × |
16431 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand four hundred and thirty-one |
| Binary (base 2) | 100000000101111 |
| Octal (base 8) | 40057 |
| Hexadecimal (base 16) | 402F |
| Base 3 | 211112120 |
| As time | 16431 seconds = 4 h 33 min 51 s |
Is 16431 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 | Yes (16431 ÷ 3 = 5477) | 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 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | 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 6) | 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 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 16431 a prime number?
No. 16431 = 3 × 5477, so it is divisible by 3.
What are the factors of 16431?
1, 3, 5477, 16431.
What is 16431 in binary?
100000000101111 (hexadecimal 402F, octal 40057).
What is the square root of 16431?
About 128.1835.
Is 16431 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 16431?
16431 is a semiprime: 3 × 5477, the product of two primes.