551544 has 64 divisors (see below), whose sum is σ = 1632000. Its totient is φ = 155232.

The previous prime is 551543. The next prime is 551549. The reversal of 551544 is 445155.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a zygodrome in base 7.

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 551544.

It is not an unprimeable number, because it can be changed into a prime (551543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8199 + ... + 8265.

It is an arithmetic number, because the mean of its divisors is an integer number (25500).

2⁵⁵¹⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816000).

551544 is an abundant number, since it is smaller than the sum of its proper divisors (1080456).

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

551544 is a wasteful number, since it uses less digits than its factorization.

551544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 79 counting only the distinct ones).

The product of its digits is 2000, while the sum is 24.

The square root of 551544 is about 742.6600837530. The cubic root of 551544 is about 82.0087240371.

Adding to 551544 its reverse (445155), we get a palindrome (996699).

The spelling of 551544 in words is "five hundred fifty-one thousand, five hundred forty-four".