195 (number)

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195 is the natural number following 194 and preceding 196.

List of numbers — Integers << 190 191 192 193 194 195 196 197 198 199 >>
Cardinal	One hundred [and] ninety-five
Ordinal	195th
Factorization
Roman numeral	CXCV
Binary	11000011
Hexadecimal	C3

195 is a sphenic number, coming in the middle of the prime quadruplet 191, 193, 197 and 199. 195 is the sum of eleven consecutive primes (3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37). Although not itself prime, 195 passes through Ulam's sieve and thus is a lucky number. The smallest number that can be expressed as a sum of distinct squares in 16 different ways is 195 (sequence A097563 in OEIS). 195 is a Harshad number.

[edit] In other fields

• As of December 2008^[update] there are 195 countries in the world (if Taiwan is included).

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