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29 (twenty-nine) is the natural number following 28 and preceding 30.

1 In mathematics

It is the tenth prime number, and also a primorial prime, the next prime number as well as primoral prime being thirty-one, with which it comprises a twin prime. Twenty-nine is also a Sophie Germain prime. It is also the sum of three squares, 2² + 3² + 4². It is a Lucas number, a Pell number and a tetranacci number.

2 In other fields

The lunar monthIn Egyptian mythology, Month is an alternate spelling for Menthu. The month is a unit of time, used with calendars, which is approximately as long as some natural period related to the motion of the Moon (i. The traditional concept arose with the cycle of is very close to twenty-nine days.

Twenty-nine is:

• The atomic numberThe atomic number Z is a term used in chemistry and physics to represent the number of protons found in the nucleus of an atom. In an atom of neutral charge, the number of electrons typically equals the atomic number. The atomic number originally meant th of copperCopper is a chemical element in the periodic table that has the symbol Cu and atomic number 29. Notable characteristics Copper is a reddish-coloured metal, with a high electrical and thermal conductivity (among pure metals at room temperature, only silver.
• The number of bones in a normal human skullFor symbolic or mythic uses of the human skull, see Skull (symbolism). A skull or cranium is a bony structure which serves as the general framework for a head. The skull attempts to protect the brain, acting as a form of natural helmet. Humans In humans,.
• The number of days FebruaryFebruary is the second month of the year in the Gregorian Calendar, with 28 days in regular years. In leap years February has 29 days. Three times in history a February 30 did occur. February was named for the Roman god Februus, the god of purification. has on leap yearA leap year (or intercalary year is a year containing an extra day or month in order to keep the calendar year in sync with an astronomical or seasonal year. Seasons and astronomical events do not repeat at an exact number of days, so a calendar which hads.
• The number of letters in the Finnish and Norwegian alphabets.
• The designation of Interstate 29, a freeway that runs from Missouri to North Dakota.
• In the name of the town Twentynine Palms, California, also the name of the adjoining Marine Corps base, affectionately referred to by Marines as "Twentynine Stumps".
• Historical years: 29 A.D., 29 B.C., or 1929