🔍 数字性质查询Number Properties Checker
查看一个整数的各种性质：奇偶、质数、完全数、平方数、因数个数、数字和、二进制等。See an integer's properties: parity, prime, perfect, square, divisors, digit sum, binary and more.
使用说明与常见问题How-to & FAQ
「数字性质查询」是什么？What is the Number Properties Checker?
查看一个整数的各种性质：奇偶、质数、完全数、平方数、因数个数、数字和、二进制等。See an integer's properties: parity, prime, perfect, square, divisors, digit sum, binary and more.
如何使用「数字性质查询」？How do I use the Number Properties Checker?
在「数字性质查询」中，填写「整数」等参数，结果会随输入实时计算并显示在下方。In the Number Properties Checker: Fill in "Integer"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「数字性质查询」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Number Properties Checker uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「数字性质查询」免费吗？需要注册吗？Is the Number Properties Checker free? Do I need an account?
「数字性质查询」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Number Properties Checker is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.