555243221 has 8 divisors (see below), whose sum is σ = 598398360. Its totient is φ = 512151552.

The previous prime is 555243203. The next prime is 555243281. The reversal of 555243221 is 122342555.

It can be written as a sum of positive squares in 4 ways, for example, as 5340721 + 549902500 = 2311^2 + 23450^2 .

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 555243221 - 2²² = 551048917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555243281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3161 + ... + 33473.

It is an arithmetic number, because the mean of its divisors is an integer number (74799795).

Almost surely, 2^555243221 is an apocalyptic number.

It is an amenable number.

555243221 is a deficient number, since it is larger than the sum of its proper divisors (43155139).

555243221 is a wasteful number, since it uses less digits than its factorization.

555243221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31735.

The product of its digits is 12000, while the sum is 29.

The square root of 555243221 is about 23563.5994915887. The cubic root of 555243221 is about 821.9166059137.

Adding to 555243221 its reverse (122342555), we get a palindrome (677585776).

The spelling of 555243221 in words is "five hundred fifty-five million, two hundred forty-three thousand, two hundred twenty-one".