204321091 has 16 divisors (see below), whose sum is σ = 223449408. Its totient is φ = 185702400.

The previous prime is 204321077. The next prime is 204321109. The reversal of 204321091 is 190123402.

It is not a de Polignac number, because 204321091 - 2⁵ = 204321059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204321191) 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, 391911 + ... + 392431.

It is an arithmetic number, because the mean of its divisors is an integer number (13965588).

Almost surely, 2^204321091 is an apocalyptic number.

204321091 is a deficient number, since it is larger than the sum of its proper divisors (19128317).

204321091 is a wasteful number, since it uses less digits than its factorization.

204321091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 204321091 is about 14294.0928708330. The cubic root of 204321091 is about 588.9852239311.

Adding to 204321091 its reverse (190123402), we get a palindrome (394444493).

The spelling of 204321091 in words is "two hundred four million, three hundred twenty-one thousand, ninety-one".