550558221 has 8 divisors (see below), whose sum is σ = 734299104. Its totient is φ = 366928080.

The previous prime is 550558219. The next prime is 550558259. The reversal of 550558221 is 122855055.

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

It is not a de Polignac number, because 550558221 - 2¹ = 550558219 is a prime.

It is a super-2 number, since 2×550558221² = 606228709421369682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550558321) 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, 15291 + ... + 36536.

It is an arithmetic number, because the mean of its divisors is an integer number (91787388).

Almost surely, 2^550558221 is an apocalyptic number.

It is an amenable number.

550558221 is a deficient number, since it is larger than the sum of its proper divisors (183740883).

550558221 is a wasteful number, since it uses less digits than its factorization.

550558221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55371.

The product of its (nonzero) digits is 20000, while the sum is 33.

The square root of 550558221 is about 23463.9770925562. The cubic root of 550558221 is about 819.5983661723.

The spelling of 550558221 in words is "five hundred fifty million, five hundred fifty-eight thousand, two hundred twenty-one".