204712091 has 4 divisors (see below), whose sum is σ = 204740712. Its totient is φ = 204683472.

The previous prime is 204712069. The next prime is 204712117. The reversal of 204712091 is 190217402.

204712091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 190217402 = 2 ⋅95108701.

It is a cyclic number.

It is not a de Polignac number, because 204712091 - 2¹⁴ = 204695707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204712091.

It is not an unprimeable number, because it can be changed into a prime (204712051) 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, 6776 + ... + 21338.

It is an arithmetic number, because the mean of its divisors is an integer number (51185178).

Almost surely, 2^204712091 is an apocalyptic number.

204712091 is a deficient number, since it is larger than the sum of its proper divisors (28621).

204712091 is a wasteful number, since it uses less digits than its factorization.

204712091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28620.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 204712091 is about 14307.7633122721. The cubic root of 204712091 is about 589.3606892944.

Adding to 204712091 its reverse (190217402), we get a palindrome (394929493).

The spelling of 204712091 in words is "two hundred four million, seven hundred twelve thousand, ninety-one".