551604 has 24 divisors (see below), whose sum is σ = 1318240. Its totient is φ = 179424.

The previous prime is 551597. The next prime is 551651. The reversal of 551604 is 406155.

It is a happy 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 551604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19 + ... + 1050.

2⁵⁵¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

551604 is an abundant number, since it is smaller than the sum of its proper divisors (766636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551604 is a wasteful number, since it uses less digits than its factorization.

551604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119 (or 1117 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 551604 is about 742.7004779856. The cubic root of 551604 is about 82.0116977165.

Adding to 551604 its reverse (406155), we get a palindrome (957759).

The spelling of 551604 in words is "five hundred fifty-one thousand, six hundred four".