# 1521

## 1,521 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1521 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 9 divisors.

1521 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of nine divisors.

## Prime factorization of 1521:

### 32 × 132

(3 × 3 × 13 × 13)

See below for interesting mathematical facts about the number 1521 from the Numbermatics database.

### Names of 1521

• Cardinal: 1521 can be written as One thousand, five hundred twenty-one.

### Scientific notation

• Scientific notation: 1.521 × 103

### Factors of 1521

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 16

### Divisors of 1521

• Number of divisors d(n): 9
• Complete list of divisors:
• Sum of all divisors σ(n): 2379
• Sum of proper divisors (its aliquot sum) s(n): 858
• 1521 is a deficient number, because the sum of its proper divisors (858) is less than itself. Its deficiency is 663

### Bases of 1521

• Binary: 101111100012
• Base-36: 169

### Squares and roots of 1521

• 1521 squared (15212) is 2313441
• 1521 cubed (15213) is 3518743761
• 1521 is a perfect square number. Its square root is 39
• The cube root of 1521 is 11.5003150513

### Scales and comparisons

How big is 1521?
• 1,521 seconds is equal to 25 minutes, 21 seconds.
• To count from 1 to 1,521 would take you about twenty-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 1521 cubic inches would be around 1 feet tall.

### Recreational maths with 1521

• 1521 backwards is 1251
• 1521 is a Harshad number.
• The number of decimal digits it has is: 4
• The sum of 1521's digits is 9
• More coming soon!