204640361 has 4 divisors (see below), whose sum is σ = 213537792. Its totient is φ = 195742932.

The previous prime is 204640349. The next prime is 204640369. The reversal of 204640361 is 163046402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204640361 - 2²⁶ = 137531497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 204640361.

It is not an unprimeable number, because it can be changed into a prime (204640369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4448681 + ... + 4448726.

It is an arithmetic number, because the mean of its divisors is an integer number (53384448).

Almost surely, 2^204640361 is an apocalyptic number.

It is an amenable number.

204640361 is a deficient number, since it is larger than the sum of its proper divisors (8897431).

204640361 is an equidigital number, since it uses as much as digits as its factorization.

204640361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8897430.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 204640361 is about 14305.2564115433. The cubic root of 204640361 is about 589.2918449960.

Adding to 204640361 its reverse (163046402), we get a palindrome (367686763).

The spelling of 204640361 in words is "two hundred four million, six hundred forty thousand, three hundred sixty-one".