Number 53

A page of the Numeropedia - the Special Encyclopedia of Numbers

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[Calendar]  The maximum number of any weekdays in a calendar year. (At most 2 such weekday in a calendar year.

 

[Chem.]  The atomic number of Iodine (I).

 

[Math.]  A bi-truncatable prime number.

 

[Math.]  The smallest case of 3 consecutive prime numbers in an arithmetic progression (of common difference 6): 47, 53 and 59.

 

[Math.]  535 = 418,195,493 = (4+18+1+9+5+4+9+3)5

537 = 1,174,711,139,837 = (1+1+7+4+7+1+1+1+3+9+8+3+7)7.

 

[Math.]  Sum of all prime numbers from 7 to 53 is the product of 2 numbers themselves, 7 and 53:  371 = 7×53 = 7+11+13+17+19+23+29+31+37+41+43+47+53.

 

[Math.]  1353 = 3×11×41 is sum of 41 consecutive numbers from 13 to 53: 13+14+15+…+51+52+53 = 1353.

 

[Math.]  One of two 2-digit prime numbers whose digits are consecutive prime numbers. The other prime number is 23.

 

[Math.]  555533333 is divisible by 53: 555533333 = 53×10481761.

              44333 is divisible by 43: 44333 = 43×1031.

              22333 is divisible by 23: 22333 = 23×971.

 

[Money]  A MasterCard credit card number starts with either 2 digits 51, 52, 53, 54 or 55.

 

[Phone]  International telephone dialing code for Cuba (including the U.S. Naval Base, Guantanamo Bay).

 

[Sport]  The maximum number of players in the roster of an NFL (National Football League) team during a season.