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: 903542 = 2 ⋅451771.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-245309 is a prime.
It is a house number.
It is a Duffinian number.
It is a Curzon number.
It is a congruent number.
2245309 is an apocalyptic number.
It is an amenable number.
245309 is a wasteful number, since it uses less digits than its factorization.
245309 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 12930.
The square root of 245309 is about 495.2867856101. The cubic root of 245309 is about 62.5995427092.
The spelling of 245309 in words is "two hundred forty-five thousand, three hundred nine".