# 1155

## 1,155 is an odd composite number composed of four prime numbers multiplied together.

What does the number 1155 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 16 divisors.

1155 is an odd composite number. It is composed of four distinct prime numbers multiplied together. It has a total of sixteen divisors.

## Prime factorization of 1155:

### 3 × 5 × 7 × 11

See below for interesting mathematical facts about the number 1155 from the Numbermatics database.

### Names of 1155

• Cardinal: 1155 can be written as One thousand, one hundred fifty-five.

### Scientific notation

• Scientific notation: 1.155 × 103

### Factors of 1155

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 26

### Divisors of 1155

• Number of divisors d(n): 16
• Complete list of divisors:
• Sum of all divisors σ(n): 2304
• Sum of proper divisors (its aliquot sum) s(n): 1149
• 1155 is a deficient number, because the sum of its proper divisors (1149) is less than itself. Its deficiency is 6

### Bases of 1155

• Binary: 100100000112
• Base-36: W3

### Squares and roots of 1155

• 1155 squared (11552) is 1334025
• 1155 cubed (11553) is 1540798875
• The square root of 1155 is 33.9852909359
• The cube root of 1155 is 10.4920574857

### Scales and comparisons

How big is 1155?
• 1,155 seconds is equal to 19 minutes, 15 seconds.
• To count from 1 to 1,155 would take you about nineteen 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 1155 cubic inches would be around 0.9 feet tall.

### Recreational maths with 1155

• 1155 backwards is 5511
• The number of decimal digits it has is: 4
• The sum of 1155's digits is 12
• More coming soon!