# 145

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

What does the number 145 look like?

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

145 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 145:

### 5 × 29

See below for interesting mathematical facts about the number 145 from the Numbermatics database.

### Names of 145

• Cardinal: 145 can be written as One hundred forty-five.

### Scientific notation

• Scientific notation: 1.45 × 102

### Factors of 145

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 34

### Divisors of 145

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 180
• Sum of proper divisors (its aliquot sum) s(n): 35
• 145 is a deficient number, because the sum of its proper divisors (35) is less than itself. Its deficiency is 110

### Bases of 145

• Binary: 100100012
• Base-36: 41

### Squares and roots of 145

• 145 squared (1452) is 21025
• 145 cubed (1453) is 3048625
• The square root of 145 is 12.0415945787
• The cube root of 145 is 5.2535878725

### Scales and comparisons

How big is 145?
• 145 seconds is equal to 2 minutes, 25 seconds.
• To count from 1 to 145 would take you about twelve seconds.

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 145 cubic inches would be around 0.4 feet tall.

### Recreational maths with 145

• 145 backwards is 541
• The number of decimal digits it has is: 3
• The sum of 145's digits is 10
• More coming soon!