550191 has 4 divisors (see below), whose sum is σ = 733592. Its totient is φ = 366792.

The previous prime is 550189. The next prime is 550211. The reversal of 550191 is 191055.

It is a happy number.

550191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 550191 - 2¹ = 550189 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91696 + ... + 91701.

It is an arithmetic number, because the mean of its divisors is an integer number (183398).

2⁵⁵⁰¹⁹¹ is an apocalyptic number.

550191 is a deficient number, since it is larger than the sum of its proper divisors (183401).

550191 is a wasteful number, since it uses less digits than its factorization.

550191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183400.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 550191 is about 741.7486097055. The cubic root of 550191 is about 81.9416102268.

It can be divided in two parts, 550 and 191, that added together give a triangular number (741 = T₃₈).

The spelling of 550191 in words is "five hundred fifty thousand, one hundred ninety-one".