551520 has 72 divisors (see below), whose sum is σ = 1886976. Its totient is φ = 146688.

The previous prime is 551519. The next prime is 551539. The reversal of 551520 is 25155.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 551493 and 551502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1249 + ... + 1631.

It is an arithmetic number, because the mean of its divisors is an integer number (26208).

2⁵⁵¹⁵²⁰ 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 551520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943488).

551520 is an abundant number, since it is smaller than the sum of its proper divisors (1335456).

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

551520 is a wasteful number, since it uses less digits than its factorization.

551520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 551520 is about 742.6439254448. The cubic root of 551520 is about 82.0075345050.

Adding to 551520 its reverse (25155), we get a palindrome (576675).

The spelling of 551520 in words is "five hundred fifty-one thousand, five hundred twenty".