204671811 has 4 divisors (see below), whose sum is σ = 272895752. Its totient is φ = 136447872.

The previous prime is 204671783. The next prime is 204671837. The reversal of 204671811 is 118176402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 204671811 - 2⁷ = 204671683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204671851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34111966 + ... + 34111971.

It is an arithmetic number, because the mean of its divisors is an integer number (68223938).

Almost surely, 2^204671811 is an apocalyptic number.

204671811 is a deficient number, since it is larger than the sum of its proper divisors (68223941).

204671811 is an equidigital number, since it uses as much as digits as its factorization.

204671811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68223940.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 204671811 is about 14306.3556155997. The cubic root of 204671811 is about 589.3220317410.

The spelling of 204671811 in words is "two hundred four million, six hundred seventy-one thousand, eight hundred eleven".