550891 has 8 divisors (see below), whose sum is σ = 611568. Its totient is φ = 492000.

The previous prime is 550861. The next prime is 550903. The reversal of 550891 is 198055.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 550891 - 2⁵ = 550859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (550801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261 + ... + 1081.

It is an arithmetic number, because the mean of its divisors is an integer number (76446).

2⁵⁵⁰⁸⁹¹ is an apocalyptic number.

550891 is a deficient number, since it is larger than the sum of its proper divisors (60677).

550891 is a wasteful number, since it uses less digits than its factorization.

550891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 550891 is about 742.2203176955. The cubic root of 550891 is about 81.9763465387.

Subtracting from 550891 its reverse (198055), we obtain a square (352836 = 594²).

It can be divided in two parts, 550 and 891, that added together give a palindrome (1441).

The spelling of 550891 in words is "five hundred fifty thousand, eight hundred ninety-one".