204351391 has 2 divisors, whose sum is σ = 204351392. Its totient is φ = 204351390.

The previous prime is 204351379. The next prime is 204351401. The reversal of 204351391 is 193153402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204351391 - 2¹⁵ = 204318623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204351311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102175695 + 102175696.

It is an arithmetic number, because the mean of its divisors is an integer number (102175696).

Almost surely, 2^204351391 is an apocalyptic number.

204351391 is a deficient number, since it is larger than the sum of its proper divisors (1).

204351391 is an equidigital number, since it uses as much as digits as its factorization.

204351391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 204351391 is about 14295.1527099223. The cubic root of 204351391 is about 589.0143372091.

The spelling of 204351391 in words is "two hundred four million, three hundred fifty-one thousand, three hundred ninety-one".