550443221 has 4 divisors (see below), whose sum is σ = 582822252. Its totient is φ = 518064192.

The previous prime is 550443217. The next prime is 550443239. The reversal of 550443221 is 122344055.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 278556100 + 271887121 = 16690^2 + 16489^2 .

It is a cyclic number.

It is not a de Polignac number, because 550443221 - 2² = 550443217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550443211) 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, 16189490 + ... + 16189523.

It is an arithmetic number, because the mean of its divisors is an integer number (145705563).

Almost surely, 2^550443221 is an apocalyptic number.

It is an amenable number.

550443221 is a deficient number, since it is larger than the sum of its proper divisors (32379031).

550443221 is a wasteful number, since it uses less digits than its factorization.

550443221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32379030.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 550443221 is about 23461.5263996186. The cubic root of 550443221 is about 819.5412965947.

Adding to 550443221 its reverse (122344055), we get a palindrome (672787276).

The spelling of 550443221 in words is "five hundred fifty million, four hundred forty-three thousand, two hundred twenty-one".