Number Gossip
(Enter a number and I'll tell you everything you wanted to know about it but were afraid to ask.)
Unique Properties of 603
- 603 is the smallest number such that n2 + φ(n)2 + σ(n)2 is a square
- 603 is the smallest number that starts a set of three consecutive numbers with the same prime signature 1,2 (603=32*67, 604=22*151, 605=5*112)
Common Properties of 603
A positive integer greater than 1 that is not prime is called composite.
Composite numbers are opposite to prime numbers.
The number n is deficient if the sum of all its positive divisors except itself is less than n.
Compare with perfect and abundant numbers.
The number n is evil if it has an even number of 1's in its binary expansion.
Guess what odious numbers are.
A number is odd if it is not divisible by 2.
Numbers that are not odd are even. Compare with another pair -- evil and odious numbers.