204309691 has 2 divisors, whose sum is σ = 204309692. Its totient is φ = 204309690.

The previous prime is 204309659. The next prime is 204309719. The reversal of 204309691 is 196903402.

204309691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204309691 - 2⁵ = 204309659 is a prime.

It is not a weakly prime, because it can be changed into another prime (204303691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102154845 + 102154846.

It is an arithmetic number, because the mean of its divisors is an integer number (102154846).

Almost surely, 2^204309691 is an apocalyptic number.

204309691 is a deficient number, since it is larger than the sum of its proper divisors (1).

204309691 is an equidigital number, since it uses as much as digits as its factorization.

204309691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 204309691 is about 14293.6940991474. The cubic root of 204309691 is about 588.9742696754.

The spelling of 204309691 in words is "two hundred four million, three hundred nine thousand, six hundred ninety-one".