# 209

## 209 is an odd composite number composed of two prime numbers multiplied together.

What does the number 209 look like?

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

209 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 209:

### 11 × 19

See below for interesting mathematical facts about the number 209 from the Numbermatics database.

### Names of 209

• Cardinal: 209 can be written as Two hundred nine.

### Scientific notation

• Scientific notation: 2.09 × 102

### Factors of 209

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 30

### Divisors of 209

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 240
• Sum of proper divisors (its aliquot sum) s(n): 31
• 209 is a deficient number, because the sum of its proper divisors (31) is less than itself. Its deficiency is 178

### Bases of 209

• Binary: 110100012
• Base-36: 5T

### Squares and roots of 209

• 209 squared (2092) is 43681
• 209 cubed (2093) is 9129329
• The square root of 209 is 14.4568322949
• The cube root of 209 is 5.9344721404

### Scales and comparisons

How big is 209?
• 209 seconds is equal to 3 minutes, 29 seconds.
• To count from 1 to 209 would take you about forty-four seconds.

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 209 cubic inches would be around 0.5 feet tall.

### Recreational maths with 209

• 209 backwards is 902
• 209 is a Harshad number.
• The number of decimal digits it has is: 3
• The sum of 209's digits is 11
• More coming soon!