249559 has 4 divisors (see below), whose sum is σ = 250560. Its totient is φ = 248560.

The previous prime is 249541. The next prime is 249563. The reversal of 249559 is 955942.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 249559 - 2¹⁵ = 216791 is a prime.

It is a Duffinian number.

249559 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219 + ... + 739.

It is an arithmetic number, because the mean of its divisors is an integer number (62640).

2²⁴⁹⁵⁵⁹ is an apocalyptic number.

249559 is a deficient number, since it is larger than the sum of its proper divisors (1001).

249559 is an equidigital number, since it uses as much as digits as its factorization.

249559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000.

The product of its digits is 16200, while the sum is 34.

The square root of 249559 is about 499.5588053473. The cubic root of 249559 is about 62.9589890140.

It can be divided in two parts, 24955 and 9, that added together give a square (24964 = 158²).

The spelling of 249559 in words is "two hundred forty-nine thousand, five hundred fifty-nine".