550221569 has 2 divisors, whose sum is σ = 550221570. Its totient is φ = 550221568.

The previous prime is 550221563. The next prime is 550221583. The reversal of 550221569 is 965122055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514699969 + 35521600 = 22687^2 + 5960^2 .

It is a cyclic number.

It is not a de Polignac number, because 550221569 - 2⁸ = 550221313 is a prime.

It is a super-2 number, since 2×550221569² = 605487549985643522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (550221563) 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 as a sum of consecutive naturals, namely, 275110784 + 275110785.

It is an arithmetic number, because the mean of its divisors is an integer number (275110785).

Almost surely, 2^550221569 is an apocalyptic number.

It is an amenable number.

550221569 is a deficient number, since it is larger than the sum of its proper divisors (1).

550221569 is an equidigital number, since it uses as much as digits as its factorization.

550221569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 550221569 is about 23456.8021904095. The cubic root of 550221569 is about 819.4312777659.

The spelling of 550221569 in words is "five hundred fifty million, two hundred twenty-one thousand, five hundred sixty-nine".