249959 has 4 divisors (see below), whose sum is σ = 255816. Its totient is φ = 244104.

The previous prime is 249947. The next prime is 249967. The reversal of 249959 is 959942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959942 = 2 ⋅479971.

It is a cyclic number.

It is not a de Polignac number, because 249959 - 2⁴ = 249943 is a prime.

It is a Duffinian 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 249959.

It is not an unprimeable number, because it can be changed into a prime (249989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2864 + ... + 2949.

It is an arithmetic number, because the mean of its divisors is an integer number (63954).

2²⁴⁹⁹⁵⁹ is an apocalyptic number.

249959 is a deficient number, since it is larger than the sum of its proper divisors (5857).

249959 is an equidigital number, since it uses as much as digits as its factorization.

249959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856.

The product of its digits is 29160, while the sum is 38.

The square root of 249959 is about 499.9589983189. The cubic root of 249959 is about 62.9926085223.

The spelling of 249959 in words is "two hundred forty-nine thousand, nine hundred fifty-nine".