245 (two hundred
ndforty-five) is the
natural number
In mathematics, the natural numbers are the numbers 0, 1, 2, 3, and so on, possibly excluding 0. Some start counting with 0, defining the natural numbers as the non-negative integers , while others start with 1, defining them as the positive in ...
following
244
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Year 244 ( CCXLIV) was a leap year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Armenius and Aemilianus (or, less frequently, year 997 ''Ab urbe condita''). The denomination 2 ...
and preceding
246
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Year 246 ( CCXLVI) was a common year starting on Thursday of the Julian calendar, the 246th Year of the Common Era ( CE) and Anno Domini ( AD) designations, the 246th year of the 1st millennium, the 46th year of the 3rd century, and t ...
.
Additionally, 245 is:
*a
composite number
A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Accordingly it is a positive integer that has at least one divisor other than 1 and itself. Every positive integer is composite, prime numb ...
.
*a
stella octangula number.
*palindromic in bases 34 (77
34) and 48 (55
48)
*a
Harshad number
In mathematics, a harshad number (or Niven number) in a given radix, number base is an integer that is divisible by the digit sum, sum of its digits when written in that base. Harshad numbers in base are also known as -harshad (or -Niven) numbers ...
in bases 7, 9, 11, 15, 31, 35, 36 (and 14 other bases).
*the aliquot sum of any of these numbers: 723, 1195, 2563, 3859,
*part of the 97-aliquot tree.
4624, 4893, 2595, 1581, 723, 245
,
References
Integers
{{Num-stub