551550 has 24 divisors (see below), whose sum is σ = 1368216. Its totient is φ = 147040.

The previous prime is 551549. The next prime is 551557. The reversal of 551550 is 55155.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551557) 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 11 ways as a sum of consecutive naturals, for example, 1689 + ... + 1988.

It is an arithmetic number, because the mean of its divisors is an integer number (57009).

2⁵⁵¹⁵⁵⁰ is an apocalyptic number.

551550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

551550 is an abundant number, since it is smaller than the sum of its proper divisors (816666).

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

551550 is a wasteful number, since it uses less digits than its factorization.

551550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3692 (or 3687 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 21.

The square root of 551550 is about 742.6641232751. The cubic root of 551550 is about 82.0090214147.

It can be divided in two parts, 5515 and 50, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 551550 in words is "five hundred fifty-one thousand, five hundred fifty".