# 1891

## 1,891 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1891 look like?

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

1891 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 1891:

### 31 × 61

See below for interesting mathematical facts about the number 1891 from the Numbermatics database.

### Names of 1891

• Cardinal: 1891 can be written as One thousand, eight hundred ninety-one.

### Scientific notation

• Scientific notation: 1.891 × 103

### Factors of 1891

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 92

### Divisors of 1891

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 1984
• Sum of proper divisors (its aliquot sum) s(n): 93
• 1891 is a deficient number, because the sum of its proper divisors (93) is less than itself. Its deficiency is 1798

### Bases of 1891

• Binary: 111011000112
• Base-36: 1GJ

### Squares and roots of 1891

• 1891 squared (18912) is 3575881
• 1891 cubed (18913) is 6761990971
• The square root of 1891 is 43.4856298103
• The cube root of 1891 is 12.3660360891

### Scales and comparisons

How big is 1891?
• 1,891 seconds is equal to 31 minutes, 31 seconds.
• To count from 1 to 1,891 would take you about thirty-one 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 1891 cubic inches would be around 1 feet tall.

### Recreational maths with 1891

• 1891 backwards is 1981
• The number of decimal digits it has is: 4
• The sum of 1891's digits is 19
• More coming soon!

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The information we have on file for 1891 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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