# 1145

## 1,145 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1145 look like?

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

1145 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 1145:

### 5 × 229

See below for interesting mathematical facts about the number 1145 from the Numbermatics database.

### Names of 1145

• Cardinal: 1145 can be written as One thousand, one hundred forty-five.

### Scientific notation

• Scientific notation: 1.145 × 103

### Factors of 1145

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 234

### Divisors of 1145

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 1380
• Sum of proper divisors (its aliquot sum) s(n): 235
• 1145 is a deficient number, because the sum of its proper divisors (235) is less than itself. Its deficiency is 910

### Bases of 1145

• Binary: 100011110012
• Base-36: VT

### Squares and roots of 1145

• 1145 squared (11452) is 1311025
• 1145 cubed (11453) is 1501123625
• The square root of 1145 is 33.8378486315
• The cube root of 1145 is 10.4616895661

### Scales and comparisons

How big is 1145?
• 1,145 seconds is equal to 19 minutes, 5 seconds.
• To count from 1 to 1,145 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 1145 cubic inches would be around 0.9 feet tall.

### Recreational maths with 1145

• 1145 backwards is 5411
• The number of decimal digits it has is: 4
• The sum of 1145's digits is 11
• More coming soon!