# 19811

## 19,811 is an odd composite number composed of two prime numbers multiplied together.

What does the number 19811 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

19811 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

## Prime factorization of 19811:

### 11 × 1801

See below for interesting mathematical facts about the number 19811 from the Numbermatics database.

### Names of 19811

• Cardinal: 19811 can be written as Nineteen thousand, eight hundred eleven.

### Scientific notation

• Scientific notation: 1.9811 × 104

### Factors of 19811

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 1812

### Divisors of 19811

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 21624
• Sum of proper divisors (its aliquot sum) s(n): 1813
• 19811 is a deficient number, because the sum of its proper divisors (1813) is less than itself. Its deficiency is 17998

### Bases of 19811

• Binary: 1001101011000112
• Base-36: FAB

### Squares and roots of 19811

• 19811 squared (198112) is 392475721
• 19811 cubed (198113) is 7775336508731
• The square root of 19811 is 140.7515541655
• The cube root of 19811 is 27.0584012499

### Scales and comparisons

How big is 19811?
• 19,811 seconds is equal to 5 hours, 30 minutes, 11 seconds.
• To count from 1 to 19,811 would take you about five hours.

This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 19811 cubic inches would be around 2.3 feet tall.

### Recreational maths with 19811

• 19811 backwards is 11891
• The number of decimal digits it has is: 5
• The sum of 19811's digits is 20
• More coming soon!