204219081 has 36 divisors (see below), whose sum is σ = 325888836. Its totient is φ = 123140160.

The previous prime is 204219077. The next prime is 204219091. The reversal of 204219081 is 180912402.

It can be written as a sum of positive squares in 2 ways, for example, as 137241225 + 66977856 = 11715^2 + 8184^2 .

It is not a de Polignac number, because 204219081 - 2² = 204219077 is a prime.

It is a super-2 number, since 2×204219081² = 83410866088969122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204219031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 301315 + ... + 301991.

Almost surely, 2^204219081 is an apocalyptic number.

It is an amenable number.

204219081 is a deficient number, since it is larger than the sum of its proper divisors (121669755).

204219081 is a wasteful number, since it uses less digits than its factorization.

204219081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982 (or 968 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 204219081 is about 14290.5241681332. The cubic root of 204219081 is about 588.8871880665.

The spelling of 204219081 in words is "two hundred four million, two hundred nineteen thousand, eighty-one".