249989 has 2 divisors, whose sum is σ = 249990.
Its totient is φ = 249988.
The previous prime is 249973. The next prime is 250007. The reversal of 249989 is 989942.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 187489 + 62500 = 433^2 + 250^2
It is a cyclic number.
It is not a de Polignac number, because 249989 - 24 = 249973 is a prime.
It is a Sophie Germain prime.
It is a Curzon number.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249989.
It is not a weakly prime, because it can be changed into another prime (249089) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124994 + 124995.
It is an arithmetic number, because the mean of its divisors is an integer number (124995).
2249989 is an apocalyptic number.
It is an amenable number.
249989 is a deficient number, since it is larger than the sum of its proper divisors (1).
249989 is an equidigital number, since it uses as much as digits as its factorization.
249989 is an evil number, because the sum of its binary digits is even.
The product of its digits is 46656, while the sum is 41.
The square root of 249989 is about 499.9889998790.
The cubic root of 249989 is about 62.9951285391.
The spelling of 249989 in words is "two hundred forty-nine thousand, nine hundred eighty-nine".