249859 has 2 divisors, whose sum is σ = 249860. Its totient is φ = 249858.

The previous prime is 249857. The next prime is 249863. The reversal of 249859 is 958942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249859 - 2¹ = 249857 is a prime.

Together with 249857, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 2¹⁶ + 4⁸ + 8² + 9⁵ + 5⁴ + 9⁵ .

249859 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (249853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124929 + 124930.

It is an arithmetic number, because the mean of its divisors is an integer number (124930).

2²⁴⁹⁸⁵⁹ is an apocalyptic number.

249859 is a deficient number, since it is larger than the sum of its proper divisors (1).

249859 is an equidigital number, since it uses as much as digits as its factorization.

249859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 249859 is about 499.8589801134. The cubic root of 249859 is about 62.9842070096.

The spelling of 249859 in words is "two hundred forty-nine thousand, eight hundred fifty-nine".