661933 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: 339166 = 2 ⋅169583.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
2661933 is an apocalyptic number.
It is an amenable number.
661933 is an equidigital number, since it uses as much as digits as its factorization.
661933 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 9394.
The square root of 661933 is about 813.5926499176. The cubic root of 661933 is about 87.1507932266.
The spelling of 661933 in words is "six hundred sixty-one thousand, nine hundred thirty-three".