According to the traditional geomantic omen in China, everything has a mathematical principle, and the ID number is no exception. The ID number is a kind of symbol, and the symbols that people often carry with them have specific suggestive power. Our life is almost inseparable from numbers, such as telephone number, mobile phone number, license plate number and so on. Numbers are mathematics, including some good and bad mathematics, just as names have the meaning of affecting fortune.
The mainland identity card is 18 digits, and the first six digits are administrative area codes, that is, provinces, cities and counties; Followed by the date of birth, the date of birth accounts for 8 digits, and the last four digits are randomly given numbers.