249539 has 2 divisors, whose sum is σ = 249540. Its totient is φ = 249538.

The previous prime is 249533. The next prime is 249541. The reversal of 249539 is 935942.

249539 is nontrivially palindromic in base 16.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249539 - 2¹⁶ = 184003 is a prime.

It is a super-3 number, since 3×249539³ = 46616165378333457, which contains 333 as substring.

Together with 249541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124769 + 124770.

It is an arithmetic number, because the mean of its divisors is an integer number (124770).

2²⁴⁹⁵³⁹ is an apocalyptic number.

249539 is a deficient number, since it is larger than the sum of its proper divisors (1).

249539 is an equidigital number, since it uses as much as digits as its factorization.

249539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 32.

The square root of 249539 is about 499.5387872828. The cubic root of 249539 is about 62.9573070959.

Adding to 249539 its sum of digits (32), we get a triangular number (249571 = T₇₀₆).

The spelling of 249539 in words is "two hundred forty-nine thousand, five hundred thirty-nine".