204105161 has 16 divisors (see below), whose sum is σ = 232243200. Its totient is φ = 178022208.

The previous prime is 204105157. The next prime is 204105211. The reversal of 204105161 is 161501402.

It is not a de Polignac number, because 204105161 - 2² = 204105157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204105361) 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 15 ways as a sum of consecutive naturals, for example, 11960 + ... + 23478.

It is an arithmetic number, because the mean of its divisors is an integer number (14515200).

Almost surely, 2^204105161 is an apocalyptic number.

It is an amenable number.

204105161 is a deficient number, since it is larger than the sum of its proper divisors (28138039).

204105161 is a wasteful number, since it uses less digits than its factorization.

204105161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11608.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 204105161 is about 14286.5377541236. The cubic root of 204105161 is about 588.7776676008. Note that the first 3 decimals are identical.

Adding to 204105161 its reverse (161501402), we get a palindrome (365606563).

The spelling of 204105161 in words is "two hundred four million, one hundred five thousand, one hundred sixty-one".