249991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a sphenic number, since it is the product of 3 distinct primes.
249991 is a lucky number.
It is a congruent number.
249991 is a Friedman number, since it can be written as (491+9)^2-9, using all its digits and the basic arithmetic operations.
2249991 is an apocalyptic number.
249991 is an equidigital number, since it uses as much as digits as its factorization.
249991 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 581.
The square root of 249991 is about 499.9909999190. The cubic root of 249991 is about 62.9952965330.
The spelling of 249991 in words is "two hundred forty-nine thousand, nine hundred ninety-one".