550551 has 16 divisors (see below), whose sum is σ = 783360. Its totient is φ = 343200.

The previous prime is 550541. The next prime is 550553. The reversal of 550551 is 155055.

550551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 550551 - 2⁵ = 550519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550553) 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, 5401 + ... + 5501.

It is an arithmetic number, because the mean of its divisors is an integer number (48960).

2⁵⁵⁰⁵⁵¹ is an apocalyptic number.

550551 is the 606-th pentagonal number.

550551 is a deficient number, since it is larger than the sum of its proper divisors (232809).

550551 is a wasteful number, since it uses less digits than its factorization.

550551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206.

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

The square root of 550551 is about 741.9912398405. The cubic root of 550551 is about 81.9594782933.

The spelling of 550551 in words is "five hundred fifty thousand, five hundred fifty-one".