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A Niven number is an integer that is divisible by the sum of its digits.

Niven numbers are integers that are divisible by the sum of their digits.

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Ludolph's number is an irrational number that represents the ratio of the circumference of a circle to its diameter.

Cyclic numbers are fascinating mathematical concepts.

A cyclic number is a number that can be multiplied by any positive integer and still yield the same digits in the same order.

Hemiperfect numbers are a fascinating topic in number theory.

There are many IP numbers assigned to different devices.

The IP number of my computer is 192.168.0.1.