555005221 has 4 divisors (see below), whose sum is σ = 559056492. Its totient is φ = 550953952.

The previous prime is 555005197. The next prime is 555005293. The reversal of 555005221 is 122500555.

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 404452321 + 150552900 = 20111^2 + 12270^2 .

It is a cyclic number.

It is not a de Polignac number, because 555005221 - 2⁵ = 555005189 is a prime.

It is a super-3 number, since 3×555005221³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555005821) 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, 2025430 + ... + 2025703.

It is an arithmetic number, because the mean of its divisors is an integer number (139764123).

Almost surely, 2^555005221 is an apocalyptic number.

It is an amenable number.

555005221 is a deficient number, since it is larger than the sum of its proper divisors (4051271).

555005221 is a wasteful number, since it uses less digits than its factorization.

555005221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4051270.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 555005221 is about 23558.5487880727. The cubic root of 555005221 is about 821.7991534165.

Adding to 555005221 its reverse (122500555), we get a palindrome (677505776).

The spelling of 555005221 in words is "five hundred fifty-five million, five thousand, two hundred twenty-one".