On a job application site for my local government it reveals if a specific social security has been used or not on that site. The site is very outdated.
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We have our birthday and 4 not so random numbers at least. Also one of the numbers say if you are man or female.
Here in Sweden the personal number starts with your birthday, then a serial number and finally a checksum that also indicates your gender.
If you have an even checksum digit, that indicates that you are a woman, if you have an odd checksum digit, that indicates that you are a man.
Here you can find more information: https://en.wikipedia.org/wiki/Personal_identity_number_(Sweden)
Looks similar to Belgium.
Here it starts with your birth date, a serial number that specifies your gender (even for women, uneven for men) and a checksum.