# 641

## 641 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 641 look like?

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

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

## Prime factorization of 641:

### 641

See below for interesting mathematical facts about the number 641 from the Numbermatics database.

### Names of 641

• Cardinal: 641 can be written as Six hundred forty-one.

### Scientific notation

• Scientific notation: 6.41 × 102

### Factors of 641

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 641

### Divisors of 641

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 642
• Sum of proper divisors (its aliquot sum) s(n): 1
• 641 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 640

### Bases of 641

• Binary: 10100000012
• Base-36: HT

### Squares and roots of 641

• 641 squared (6412) is 410881
• 641 cubed (6413) is 263374721
• The square root of 641 is 25.3179778023
• The cube root of 641 is 8.6222248299

### Scales and comparisons

How big is 641?
• 641 seconds is equal to 10 minutes, 41 seconds.
• To count from 1 to 641 would take you about 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 641 cubic inches would be around 0.7 feet tall.

### Recreational maths with 641

• 641 backwards is 146
• 641 is a twin prime! Its twin is 643
• The number of decimal digits it has is: 3
• The sum of 641's digits is 11
• More coming soon!