10001 is a natural number that comes before 10002 and after 10000. 10001 is a palindromic composite number. 10001 is equaled to 73×137. When you multiply any four digit integer to 10001, it will always be the form abcd-abcd. So any number of the form abcd-abcd will always be divisible by 73 and 137.

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10001 (number) Facts for Kids. Kiddle Encyclopedia.