204302391 has 4 divisors (see below), whose sum is σ = 272403192. Its totient is φ = 136201592.

The previous prime is 204302389. The next prime is 204302471. The reversal of 204302391 is 193203402.

204302391 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 204302391 - 2¹ = 204302389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204302321) 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, 34050396 + ... + 34050401.

It is an arithmetic number, because the mean of its divisors is an integer number (68100798).

Almost surely, 2^204302391 is an apocalyptic number.

204302391 is a deficient number, since it is larger than the sum of its proper divisors (68100801).

204302391 is an equidigital number, since it uses as much as digits as its factorization.

204302391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68100800.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 204302391 is about 14293.4387395056. The cubic root of 204302391 is about 588.9672548941.

Adding to 204302391 its reverse (193203402), we get a palindrome (397505793).

The spelling of 204302391 in words is "two hundred four million, three hundred two thousand, three hundred ninety-one".