What is 31 factorial ?

Steps to calculate factorial of 31

To find 31 factorial, or 31!, simply use the formula that multiplies the number 31 by all positive whole numbers less than it.

Let’s look at how to calculate the Factorial of 31:

31! is exactly :
Factorial of 31 can be calculated as:
31! = 31 x 30 x 29 x 28 x 27 x 26 x 25 x 24 x 23 x 22 x 21 x 20 x 19 x 18 x 17 x 16 x 15 x 14 x 13 x 12 x 11 x 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1

Factorials of Numbers similar to 31

What is Factorial?

A factorial, denoted by n!, is the product of all positive integers up to a number n. Focusing on the factorial of 31, it’s crucial to understand that 31! is immensely significant in mathematics due to its applications in permutations, combinations, and the analysis of probabilities. 31! represents the total number of ways in which 31 distinct items can be arranged.

Formula to Calculate the Factorial of 31

The factorial of any number n is given by the product of all positive integers from 1 to n. The formula for calculating a factorial is:

n! = n × (n – 1) × … × 1

Applying this to 31 factorial, we write:

31! = 31 × 30 × 29 × … × 1

This multiplication results in an extremely large number, which is the total number of possible arrangements of 31 different items.

What is the Factorial of 31 Used For?

The factorial of 31, like other factorials, has several applications:

  • In combinatorics, to find out how many ways 31 different books can be arranged on a shelf.
  • In probability, to calculate the odds of various outcomes where order is significant from a set of 31 choices.
  • In certain algorithms and mathematical functions that involve series and products.


  • What is the number of zeros at the end of the value of 31!?
  • If a group has 31 different flags, in how many ways can they arrange them in a row?

Solutions to Exercises

  1. The number of zeros at the end of the value of 31! is determined by the number of times the product’s factors include the prime factors 2 and 5. Since there are more 2s than 5s, we count the number of 5s in the prime factorization of 31!. There are six 5s (from 5, 10, 15, 20, 25, and 30), so 31! ends with six zeros.
  2. There are 31! different ways to arrange 31 flags in a row. Since 31! is an immensely large number, we often use software or calculators to compute the exact value.

Frequently Asked Questions

What is the exact numerical value of 31 factorial?

The exact value of 31 factorial (31!) is a number with 33 digits: 8,222,838,654,177,922,817,725,562,880.

Why are factorials significant in statistics and probability?

Factorials are essential in statistics and probability because they are used to calculate permutations and combinations, which are key concepts for determining the number of possible outcomes in various scenarios.

Other conversions of the number 31