555545221 has 8 divisors (see below), whose sum is σ = 692627904. Its totient is φ = 432892320.

The previous prime is 555545213. The next prime is 555545233. The reversal of 555545221 is 122545555.

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

It is not a de Polignac number, because 555545221 - 2³ = 555545213 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 (555545201) 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, 3607360 + ... + 3607513.

It is an arithmetic number, because the mean of its divisors is an integer number (86578488).

Almost surely, 2^555545221 is an apocalyptic number.

It is an amenable number.

555545221 is a deficient number, since it is larger than the sum of its proper divisors (137082683).

555545221 is a wasteful number, since it uses less digits than its factorization.

555545221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7214891.

The product of its digits is 50000, while the sum is 34.

The square root of 555545221 is about 23570.0068095026. The cubic root of 555545221 is about 822.0655939707.

The spelling of 555545221 in words is "five hundred fifty-five million, five hundred forty-five thousand, two hundred twenty-one".