# 1921

## 1,921 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1921 look like?

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

1921 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 1921:

### 17 × 113

See below for interesting mathematical facts about the number 1921 from the Numbermatics database.

### Names of 1921

• Cardinal: 1921 can be written as One thousand, nine hundred twenty-one.

### Scientific notation

• Scientific notation: 1.921 × 103

### Factors of 1921

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 130

### Divisors of 1921

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 2052
• Sum of proper divisors (its aliquot sum) s(n): 131
• 1921 is a deficient number, because the sum of its proper divisors (131) is less than itself. Its deficiency is 1790

### Bases of 1921

• Binary: 111100000012
• Base-36: 1HD

### Squares and roots of 1921

• 1921 squared (19212) is 3690241
• 1921 cubed (19213) is 7088952961
• The square root of 1921 is 43.8292140017
• The cube root of 1921 is 12.4310874497

### Scales and comparisons

How big is 1921?
• 1,921 seconds is equal to 32 minutes, 1 second.
• To count from 1 to 1,921 would take you about thirty-two minutes.

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 1921 cubic inches would be around 1 feet tall.

### Recreational maths with 1921

• 1921 backwards is 1291
• The number of decimal digits it has is: 4
• The sum of 1921's digits is 13
• More coming soon!