505549 has 4 divisors (see below), whose sum is σ = 551520. Its totient is φ = 459580.

The previous prime is 505537. The next prime is 505559. The reversal of 505549 is 945505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 505549 - 2¹¹ = 503501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505559) 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, 22969 + ... + 22990.

It is an arithmetic number, because the mean of its divisors is an integer number (137880).

2⁵⁰⁵⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

505549 is a deficient number, since it is larger than the sum of its proper divisors (45971).

505549 is a wasteful number, since it uses less digits than its factorization.

505549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45970.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 505549 is about 711.0196903040. The cubic root of 505549 is about 79.6625893429.

Subtracting from 505549 its sum of digits (28), we obtain a square (505521 = 711²).

The spelling of 505549 in words is "five hundred five thousand, five hundred forty-nine".