45  

Cardinal  fortyfive 
Ordinal  45th (fortyfifth) 
Factorization  
Prime  1, 3, 5, 9, 15, 45 
Roman numeral  XLV 
Binary  101101_{2} 
Octal  55_{8} 
Duodecimal  39_{12} 
Hexadecimal  2D_{16} 
45 (fortyfive) is the natural number following 44 and followed by 46.
Contents 
Fortyfive is a triangular number, a hexagonal and 16gonal number, a Kaprekar number, and a Harshad number.
45 is the sixth positive integer with a prime factorization of the form p^{2}q, with p and q being prime.
33 is the aliquot sum of 45 and the aliquot sequence of 45 is (45,33,15,9,4,3,1,0).
Since the greatest prime factor of 45^{2} + 1 = 2026 is 1013, which is clearly more than 45 twice, 45 is a Størmer number.
The sum of all the digits is 45 (1+2+3+4+5+6+7+8+9=45)
Also The number fortyfive is pronounced 4T5 easy huh
Fortyfive may also refer to:
45 A.D., 45 B.C., 1945, 2045, etc.
Fortyfive is a number. It comes between fortyfour and fortysix, and is an odd number. It is divisible by 3, 5, 9 and 15.
