3.14159.
Pretty boring number, right? Not if you're a math and science enthusiast. If you're into numbers, it's pi, an irrational and transcendental number with more than a trillion digits after its decimal point. But when you round it off to just two numbers after its decimal point, it's 3.14 -- or March 14 -- which just so happens to be Albert Einstein's birthday.
Since math and science nerds rule the world, there is, of course, a National Pi Day. And National Pi Day, of course, is on March 14. Not wanting to miss out on the action, businesses of all kinds offer deals, discounts and freebies on Pi Day. Here are just a few ways to score deals on things like cheap pie and cheap pizza this year.
Related: The 20 Best Pizzas for Under $10
The Best National Pi Day Deals and Discounts
Both stores and restaurants love to get clever on Pi Day. Be on the lookout for word and number play, such as offers for "pizza pi" and lots of stuff for just $3.14.
&pizza: The biggest Pi Day savings by far comes from &pizza. Save about $31,000 (the price of the average wedding) by joining at least 50 other people who are taking the chain up on its offer of getting married at &pizza locations in Washington, D.C., Philadelphia and Baltimore.
AdaFruit: Get 20 percent off select Raspberry Pi products. No coupon code is needed.
Blaze Pizza: You'll pay only $3.14 for any pizza on Pi Day.
Bojangles: Get three sweet potato pies for $3.14 all day on Pi Day.
Domino's Pizza: Get a medium two-topping pan pizza for $8.99.
Grand Traverse Pie Company: Get a free slice of ABC (apple, blueberry, cherry) pie with the purchase of any entree at any of the GTPC's 16 locations in Michigan and Indiana all day on Pi Day. You can also win free pie for a year by entering the company's 3rd Annual Pi Day Video Contest.
Fresh Brothers: Get 10 percent off any pie orders when you join the Fresh Fan Club.
Half.com: Take a full 95 percent off "The Life of Pi" paperback.
Hungry Howie's: All 550 Hungry Howie's locations across the U.S., except for those in Florida, are offering a medium, one-topping pizza for $3.14 with any purchase of Howie Bread. The deal is valid on March 13 and March 14.
Maker Shed: Take 10 percent off a raspberry pi kit, no coupon code needed.
Marie Callender's: Enjoy a fresh lemon meringue pie for just $8.99.
ThinkGeek: Get a free Pi Day t-shirt when you order $31.41 worth of merchandise and use coupon code PIOUS. The nerd-chic t-shirt reads "Irrational!" The "t," however, is swapped out for the Greek symbol for pi.
My Sugar Pie: March 14 is the last day to enter to win a free $150 gift card, which is good for about five pies.
Papa John's: Chow down on a two-topping large or pan pizza pie for $9.99.
Pi Pizza: Pi Pizza is so into Pi Day that its logo is simply the Greek symbol for the numerical pi. The pizza joint goes all out with a variety of wing, beer, pizza and merchandise deals on Pi Day and "Pi Eve" on March 13.
Pieology: All locations are offering pizza with unlimited toppings for $3.14 on Pi Day.
Pizza Hut: Get a large two-topping pizza for just $7.99 during the month of March. Online orders only.
Spreadshirt: Get a Pirate Pi Day tee by Mudge Studios for just $10 with coupon code TDAY1403.
Villa Italian Kitchen: Participating Villa Italian Kitchen locations across the country are offering full-size Neapolitan cheese pizzas for $3.14.
Your Pie: All 39 Your Pie locations across 13 states are offering $3.14 pizzas, combos and craft beers.
Zazzle: You can take 14 percent off at the Zazzle Pi Day sale with coupon code 314159265358.
Thanks to a peculiar marvel of mathematics, you can count on free and cheap pizza, pie and a whole bunch of other stuff on March 14. National Pi Day is here -- release your inner nerd!
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This article originally appeared on GOBankingRates.com: 21 National Pi Day Deals, Freebies and Coupons