204109081 has 8 divisors (see below), whose sum is σ = 222768000. Its totient is φ = 185467440.

The previous prime is 204109069. The next prime is 204109117. The reversal of 204109081 is 180901402.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 204109081 - 2¹⁷ = 203978009 is a prime.

It is a super-2 number, since 2×204109081² = 83321033893329122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204109051) 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, 42595 + ... + 47143.

It is an arithmetic number, because the mean of its divisors is an integer number (27846000).

Almost surely, 2^204109081 is an apocalyptic number.

It is an amenable number.

204109081 is a deficient number, since it is larger than the sum of its proper divisors (18658919).

204109081 is a wasteful number, since it uses less digits than its factorization.

204109081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8639.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 204109081 is about 14286.6749455568. The cubic root of 204109081 is about 588.7814368892.

The spelling of 204109081 in words is "two hundred four million, one hundred nine thousand, eighty-one".