113 (number)

← 112 114 → 113
← 110 111 112 113 114 115 116 117 118 119 → List of numbers — Integers ← 100 110 120 130 140 150 160 170 180 190 →
Cardinal	one hundred [and] thirteen
Ordinal	113th (one hundred [and] thirteenth)
Factorization	prime
Prime	30th
Divisors	1, 113
Roman numeral	CXIII
Binary	11100012
Octal	1618
Duodecimal	9512
Hexadecimal	7116

113 (one hundred [and] thirteen) is the natural number following 112 and preceding 114.

In mathematics

One hundred [and] thirteen is the 30th prime number, following 109 and preceding 127, a Sophie Germain prime, a Chen prime and a Proth prime as it is a prime number of the form 7 × 2⁴ + 1. 113 is an Eisenstein prime with no imaginary part and real part of the form $3n - 1$. In base 10, this prime is a primeval number, and a permutable prime with 131 and 311.

It is a highly cototient number and a centered square number. 355/113 approximates pi to seven decimal places, with an error of less than 1/113³.

In telephony

• The fire emergency telephone number in Indonesia
• The medical emergency telephone number in Norway and Latvia
• The police emergency telephone number in Italy, Luxembourg, Slovenia and Vietnam
• The Argentina time telephone number
• The intelligence Agency telephone number in Iran

Other Fields

One hundred [and] thirteen is also:

• The port number of the IDENT Internet protocol that helps identify the user of a particular TCP connection
• Cadmium-113m is a radioisotope and nuclear isomer with a halflife of 14.1 years
• The atomic number of an element temporarily called ununtrium.
• In enduro, it is regarded as an unlucky number to be given to a race entrant and is colloquially known as a "blind pew"
• The number of surat al-Falaq in the Qur'an.
• A113 (sometimes A-113 or A1-13) is an inside joke present as an Easter egg in animated films created by CalArts alumni, refers to a classroom number^{[citation needed]}
• Psalms 113–118 constitute the Hallel, which is recited on the three great feasts, Passover, Weeks, and Tabernacles
• A French hip hop group
• It is also a rare lucky number, and has been written about by anthropologist Emily Anne McDonald.

See also

• List of highways numbered 113
• National longevity recordholders
• List of oldest people
• M113

References

• Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 134