888555221 has 4 divisors (see below), whose sum is σ = 888891552. Its totient is φ = 888218892.

The previous prime is 888555181. The next prime is 888555223. The reversal of 888555221 is 122555888.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 888555221 - 2¹⁰ = 888554197 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (888555223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164171 + ... + 169496.

It is an arithmetic number, because the mean of its divisors is an integer number (222222888).

Almost surely, 2^888555221 is an apocalyptic number.

It is an amenable number.

888555221 is a deficient number, since it is larger than the sum of its proper divisors (336331).

888555221 is a wasteful number, since it uses less digits than its factorization.

888555221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336330.

The product of its digits is 256000, while the sum is 44.

The square root of 888555221 is about 29808.6433941567. The cubic root of 888555221 is about 961.3793903892.

The spelling of 888555221 in words is "eight hundred eighty-eight million, five hundred fifty-five thousand, two hundred twenty-one".