145649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
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: 946541 = 163 ⋅5807.
It is a cyclic number.
It is a Duffinian number.
It is a Curzon number.
It is a congruent number.
2145649 is an apocalyptic number.
It is an amenable number.
145649 is an equidigital number, since it uses as much as digits as its factorization.
145649 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 20814.
The square root of 145649 is about 381.6398826119. The cubic root of 145649 is about 52.6141431894.
The spelling of 145649 in words is "one hundred forty-five thousand, six hundred forty-nine".