The one on his stomach was the seal used to imbue the Nine-tailed Fox demon inside him. It is a Reaper Death seal. This is a jutsu that his father, the Fourth Hokage, used to take away some of the fox's power by sealing it within Naruto.
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"There once was a fox Spirit with Nine Tales.""A boy had the fox spirit sealed inside him and the two spent a long time together.""A new calamity-the juubi- was revived (ten tails) but the boy became a Shinobi and together with the other Shinobi they became one and succeeded in sealing it.""The boy with the fox spirit inside him was the son of the fourth hokage. Now he is called seventh hokage..."
Uchiha Madara, aka Tobi, got the Kyuubi from naruto's mother. Namikaze Minato (Yondaime Hokage) and naruto's mother both sealed the Kyuubi in Naruto's belly button.
No Naruto and the 4th are two different people. Naruto is the 4th's son. Naruto was already born and the 4th took his own life to save the village. He sealed the 9-tailed Demon fox within Naruto [who is also the 4th's son]. So no Naruto is not the fourth hokage, but is the fourth hokage's son. NO....naruto is not the 4th hokage.........just as the previous guy said............ ok this should discussion should officialy stop due to the manga stating that already naruto is the 4ths son end of story
The fourth hokage didn't actually put the WHOLE nine tailed fox in Naruto, ever hear about yin and yang? Basically, the nine tailed has good and bad chakra, the fourth hokage only put the good chakra inside naruto, hoping that Naruto would control it.
I dont think we ever learn Naruto's favorite number, (unless it's in a filler episode that i don't remember). however i would imagine his favorite number is nine, because he has the nine tails sealed inside him.