204532391 has 8 divisors (see below), whose sum is σ = 238725120. Its totient is φ = 171583128.

The previous prime is 204532387. The next prime is 204532417. The reversal of 204532391 is 193235402.

204532391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204532391 - 2² = 204532387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204532301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310511 + ... + 311168.

It is an arithmetic number, because the mean of its divisors is an integer number (29840640).

Almost surely, 2^204532391 is an apocalyptic number.

204532391 is a deficient number, since it is larger than the sum of its proper divisors (34192729).

204532391 is an equidigital number, since it uses as much as digits as its factorization.

204532391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621733.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 204532391 is about 14301.4821259896. The cubic root of 204532391 is about 589.1881882958.

Adding to 204532391 its reverse (193235402), we get a palindrome (397767793).

The spelling of 204532391 in words is "two hundred four million, five hundred thirty-two thousand, three hundred ninety-one".