It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90305 = 5 ⋅18061.
It is a cyclic number.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
It is a congruent number.
250309 is an apocalyptic number.
It is an amenable number.
50309 is an equidigital number, since it uses as much as digits as its factorization.
50309 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7194.
The square root of 50309 is about 224.2966785309. The cubic root of 50309 is about 36.9160502343.
The spelling of 50309 in words is "fifty thousand, three hundred nine".