The game set a new record for the most-watched event in US television, beating last year's audience of 112.2 million.
Viewing peaked at 120.8 million during the last quarter, which saw the New England Patriots beat the Seattle Seahawks 28-24.
Some 118.5 million watched Katy Perry's half-time show - three million more than last year's show with Bruno Mars.
Ratings compiler Nielsen said the 12-minute performance - which also featured Lenny Kravitz and Missy Elliot - attracted the biggest half-time audience since 1991.
NBC, which broadcast the game, said the actual audience was likely to have been higher because official ratings did not count people watching in locations such as sports bars.
An additional 600,000 viewers watched the game with Spanish-language announcers on NBC's Universo cable network.
NBC Sports also offered a live stream to computers and tablets - attracting an average 800,000 people, according to Adobe Analytics.
After the game, an estimated 26.5 million people kept their TVs on NBC to watch an episode of James Spader's crime drama The Blacklist, making it the most-watched scripted programme on the network in more than a decade.
Next year's Super Bowl will be played in Santa Clara, California, and will be broadcast by CBS.

The search giant plans to stop allowing ads for loans due within 60 days or with an interest rate of 36% or higher.
Google's director of product policy David Graff said: "Our hope is that fewer people will be exposed to misleading or harmful products."
Many payday lenders rely on internet searches to generate customers.
The Online Lenders Association called Google's move "disappointing".
"It's disappointing that a site created to help give users full access to information is making arbitrary choices on the advertisements users are allowed to see from legal businesses," said the group's president, Lisa McGreevy.
It is possible Google's move could have more impact on curbing the industry than government regulation. The change takes effect on 13 July.
This is not the first time that Google has banned ads from certain industries. Ads for counterfeit goods, weapons, explosives, tobacco products and hate speech are all banned by Google.
Payday lenders have bee accused of targeting the poor and trapping them in a cycle of borrowing with high interest rates.
These types of loans are often used for unexpected or short-term expenses, such as medical bills, but come with very high interest rates and fees.
The change to Google's advertising policy will only affect lenders that fall into the short-term high-interest category.
"This change is designed to protect our users from deceptive or harmful financial products and will not affect companies offering loans such as mortgages, car loans, student loans, commercial loans, or revolving lines of credit," Mr Graff said.
Russell Hamblin-Boone, chief executive of The Consumer Finance Association (CFA) said it was disappointed by the move.
"Short term loans are a legal source of credit used by millions of people across the UK, and the industry is highly regulated, with a cap on the total cost of credit," said Russell Hamblin-Boone, the CFA's chief executive.
"Under such intense scrutiny the rogue firms have been driven out of the market, and reputable lenders will only lend to people who can afford to borrow."

The injured man went to hospital Friday evening and is in a critical but stable condition following surgery, a force spokesman said.
Officers said 15 minutes earlier police received "numerous calls" to Malvern Hill Road, Nechells, where the stabbing was believed to have happened.
Two men aged 20 are being questioned on suspicion of violent disorder.
Det Sgt Adam Hicklin said: "We know this was a targeted stabbing but at the moment we're not clear on the motive behind the attack."

Another car ploughed into the parked vehicles in Emlyn Street in Talywain near Pontypool on Sunday.
A 45-year-old woman has been charged with aggravated taking of a vehicle, driving without a licence and insurance, theft and possession of a class C drug.
She has also been bailed on suspicion of driving while unfit through drugs.
Gwent Police have talked to some witnesses but have appealed for more people who saw the incident at 15:50 BST to contact them on 101.
An estimated average of 114.4 million people watched Sunday's Super Bowl on NBC, according to initial figures.
[NEXT_CONCEPT]
Google has announced plans to ban ads from so-called payday lenders, in a move the company hopes will limit what it calls a "harmful" industry.
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A 19-year-old man was stabbed in the chest during a brawl involving up to 30 men in Birmingham, say police.
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Motorists are counting the cost after a trail of car damage was left on a street in Torfaen.