550645 has 4 divisors (see below), whose sum is σ = 660780. Its totient is φ = 440512.

The previous prime is 550637. The next prime is 550651. The reversal of 550645 is 546055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546055 = 5 ⋅109211.

It can be written as a sum of positive squares in 2 ways, for example, as 191844 + 358801 = 438^2 + 599^2 .

It is a cyclic number.

It is not a de Polignac number, because 550645 - 2³ = 550637 is a prime.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 55060 + ... + 55069.

It is an arithmetic number, because the mean of its divisors is an integer number (165195).

2⁵⁵⁰⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

550645 is a deficient number, since it is larger than the sum of its proper divisors (110135).

550645 is a wasteful number, since it uses less digits than its factorization.

550645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110134.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 550645 is about 742.0545802028. The cubic root of 550645 is about 81.9641425615.

The spelling of 550645 in words is "five hundred fifty thousand, six hundred forty-five".