550305221 has 2 divisors, whose sum is σ = 550305222. Its totient is φ = 550305220.

The previous prime is 550305209. The next prime is 550305229. The reversal of 550305221 is 122503055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342657121 + 207648100 = 18511^2 + 14410^2 .

It is a cyclic number.

It is not a de Polignac number, because 550305221 - 2¹⁸ = 550043077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550305229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275152610 + 275152611.

It is an arithmetic number, because the mean of its divisors is an integer number (275152611).

Almost surely, 2^550305221 is an apocalyptic number.

It is an amenable number.

550305221 is a deficient number, since it is larger than the sum of its proper divisors (1).

550305221 is an equidigital number, since it uses as much as digits as its factorization.

550305221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 550305221 is about 23458.5852301455. The cubic root of 550305221 is about 819.4728026082.

Adding to 550305221 its reverse (122503055), we get a palindrome (672808276).

The spelling of 550305221 in words is "five hundred fifty million, three hundred five thousand, two hundred twenty-one".