988654221 has 16 divisors (see below), whose sum is σ = 1471249920. Its totient is φ = 656143200.

The previous prime is 988654133. The next prime is 988654223. The reversal of 988654221 is 122456889.

988654221 is a `hidden beast` number, since 9 + 8 + 86 + 542 + 21 = 666.

It is not a de Polignac number, because 988654221 - 2²¹ = 986557069 is a prime.

It is a super-2 number, since 2×988654221² = 1954874337402233682, which contains 22 as substring.

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 (988654223) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76080 + ... + 88121.

It is an arithmetic number, because the mean of its divisors is an integer number (91953120).

Almost surely, 2^988654221 is an apocalyptic number.

It is an amenable number.

988654221 is a deficient number, since it is larger than the sum of its proper divisors (482595699).

988654221 is a wasteful number, since it uses less digits than its factorization.

988654221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164433 (or 164427 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 988654221 is about 31442.8723401664. The cubic root of 988654221 is about 996.2036798576.

The spelling of 988654221 in words is "nine hundred eighty-eight million, six hundred fifty-four thousand, two hundred twenty-one".