# 2155

## 2,155 is an odd composite number composed of two prime numbers multiplied together.

What does the number 2155 look like?

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

2155 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 2155:

### 5 × 431

See below for interesting mathematical facts about the number 2155 from the Numbermatics database.

### Names of 2155

• Cardinal: 2155 can be written as Two thousand, one hundred fifty-five.

### Scientific notation

• Scientific notation: 2.155 × 103

### Factors of 2155

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 436

### Divisors of 2155

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 2592
• Sum of proper divisors (its aliquot sum) s(n): 437
• 2155 is a deficient number, because the sum of its proper divisors (437) is less than itself. Its deficiency is 1718

### Bases of 2155

• Binary: 1000011010112
• Base-36: 1NV

### Squares and roots of 2155

• 2155 squared (21552) is 4644025
• 2155 cubed (21553) is 10007873875
• The square root of 2155 is 46.4219775537
• The cube root of 2155 is 12.9166261995

### Scales and comparisons

How big is 2155?
• 2,155 seconds is equal to 35 minutes, 55 seconds.
• To count from 1 to 2,155 would take you about thirty-five 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 2155 cubic inches would be around 1.1 feet tall.

### Recreational maths with 2155

• 2155 backwards is 5512
• The number of decimal digits it has is: 4
• The sum of 2155's digits is 13
• More coming soon!