988555221 has 6 divisors (see below), whose sum is σ = 1427913110. Its totient is φ = 659036808.

The previous prime is 988555201. The next prime is 988555231. The reversal of 988555221 is 122555889.

It is a happy number.

988555221 is a `hidden beast` number, since 98 + 8 + 5 + 552 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 975312900 + 13242321 = 31230^2 + 3639^2 .

It is not a de Polignac number, because 988555221 - 2⁵ = 988555189 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 (988555201) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54919726 + ... + 54919743.

Almost surely, 2^988555221 is an apocalyptic number.

It is an amenable number.

988555221 is a deficient number, since it is larger than the sum of its proper divisors (439357889).

988555221 is a wasteful number, since it uses less digits than its factorization.

988555221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109839475 (or 109839472 counting only the distinct ones).

The product of its digits is 288000, while the sum is 45.

The square root of 988555221 is about 31441.2980170985. The cubic root of 988555221 is about 996.1704267565.

The spelling of 988555221 in words is "nine hundred eighty-eight million, five hundred fifty-five thousand, two hundred twenty-one".