204307691 has 4 divisors (see below), whose sum is σ = 233494512. Its totient is φ = 175120872.

The previous prime is 204307687. The next prime is 204307693. The reversal of 204307691 is 196703402.

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 204307691 - 2² = 204307687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204307693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14593400 + ... + 14593413.

It is an arithmetic number, because the mean of its divisors is an integer number (58373628).

Almost surely, 2^204307691 is an apocalyptic number.

204307691 is a deficient number, since it is larger than the sum of its proper divisors (29186821).

204307691 is an equidigital number, since it uses as much as digits as its factorization.

204307691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29186820.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 204307691 is about 14293.6241380554. The cubic root of 204307691 is about 588.9723478341.

The spelling of 204307691 in words is "two hundred four million, three hundred seven thousand, six hundred ninety-one".