505249 has 4 divisors (see below), whose sum is σ = 514836. Its totient is φ = 495664.

The previous prime is 505237. The next prime is 505277. The reversal of 505249 is 942505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 219024 + 286225 = 468^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 505249 - 2¹⁷ = 374177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505279) 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 in 3 ways as a sum of consecutive naturals, for example, 4714 + ... + 4819.

It is an arithmetic number, because the mean of its divisors is an integer number (128709).

2⁵⁰⁵²⁴⁹ is an apocalyptic number.

It is an amenable number.

505249 is a deficient number, since it is larger than the sum of its proper divisors (9587).

505249 is an equidigital number, since it uses as much as digits as its factorization.

505249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9586.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 505249 is about 710.8086943756. The cubic root of 505249 is about 79.6468285854.

It can be divided in two parts, 50 and 5249, that multiplied together give a triangular number (262450 = T₇₂₄).

The spelling of 505249 in words is "five hundred five thousand, two hundred forty-nine".