# 1621

## 1,621 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

What does the number 1621 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

1621 is a prime number. Like all primes (except two), it is an odd number.

## Prime factorization of 1621:

### 1621

See below for interesting mathematical facts about the number 1621 from the Numbermatics database.

### Names of 1621

• Cardinal: 1621 can be written as One thousand, six hundred twenty-one.

### Scientific notation

• Scientific notation: 1.621 × 103

### Factors of 1621

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 1621

### Divisors of 1621

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 1622
• Sum of proper divisors (its aliquot sum) s(n): 1
• 1621 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 1620

### Bases of 1621

• Binary: 110010101012
• Base-36: 191

### Squares and roots of 1621

• 1621 squared (16212) is 2627641
• 1621 cubed (16213) is 4259406061
• The square root of 1621 is 40.2616442783
• The cube root of 1621 is 11.7470190113

### Scales and comparisons

How big is 1621?
• 1,621 seconds is equal to 27 minutes, 1 second.
• To count from 1 to 1,621 would take you about twenty-seven 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 1621 cubic inches would be around 1 feet tall.

### Recreational maths with 1621

• 1621 backwards is 1261
• The number of decimal digits it has is: 4
• The sum of 1621's digits is 10
• More coming soon!