# 1861

## 1,861 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

What does the number 1861 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

1861 is a prime number. Like all primes (except two), it is an odd number.

## Prime factorization of 1861:

### 1861

See below for interesting mathematical facts about the number 1861 from the Numbermatics database.

### Names of 1861

• Cardinal: 1861 can be written as One thousand, eight hundred sixty-one.

### Scientific notation

• Scientific notation: 1.861 × 103

### Factors of 1861

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 1861

### Divisors of 1861

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 1862
• Sum of proper divisors (its aliquot sum) s(n): 1
• 1861 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 1860

### Bases of 1861

• Binary: 111010001012
• Base-36: 1FP

### Squares and roots of 1861

• 1861 squared (18612) is 3463321
• 1861 cubed (18613) is 6445240381
• The square root of 1861 is 43.1393092203
• The cube root of 1861 is 12.3002930285

### Scales and comparisons

How big is 1861?
• 1,861 seconds is equal to 31 minutes, 1 second.
• To count from 1 to 1,861 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 1861 cubic inches would be around 1 feet tall.

### Recreational maths with 1861

• 1861 backwards is 1681
• The number of decimal digits it has is: 4
• The sum of 1861's digits is 16
• More coming soon!