551804 has 12 divisors (see below), whose sum is σ = 1053528. Its totient is φ = 250800.

The previous prime is 551801. The next prime is 551809. The reversal of 551804 is 408155.

It is a self number, because there is not a number n which added to its sum of digits gives 551804.

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 551804.

It is not an unprimeable number, because it can be changed into a prime (551801) 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, 6227 + ... + 6314.

It is an arithmetic number, because the mean of its divisors is an integer number (87794).

2⁵⁵¹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

551804 is a deficient number, since it is larger than the sum of its proper divisors (501724).

551804 is a wasteful number, since it uses less digits than its factorization.

551804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12556 (or 12554 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 551804 is about 742.8351095634. The cubic root of 551804 is about 82.0216084239.

Adding to 551804 its reverse (408155), we get a palindrome (959959).

The spelling of 551804 in words is "five hundred fifty-one thousand, eight hundred four".