204512491 has 4 divisors (see below), whose sum is σ = 204562984. Its totient is φ = 204462000.

The previous prime is 204512489. The next prime is 204512501. The reversal of 204512491 is 194215402.

204512491 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.

It is a cyclic number.

It is not a de Polignac number, because 204512491 - 2¹ = 204512489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204572491) 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, 18585 + ... + 27466.

It is an arithmetic number, because the mean of its divisors is an integer number (51140746).

Almost surely, 2^204512491 is an apocalyptic number.

204512491 is a deficient number, since it is larger than the sum of its proper divisors (50493).

204512491 is an equidigital number, since it uses as much as digits as its factorization.

204512491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50492.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 204512491 is about 14300.7863769794. The cubic root of 204512491 is about 589.1690793010.

Adding to 204512491 its reverse (194215402), we get a palindrome (398727893).

The spelling of 204512491 in words is "two hundred four million, five hundred twelve thousand, four hundred ninety-one".