204602561 has 4 divisors (see below), whose sum is σ = 205357824. Its totient is φ = 203847300.

The previous prime is 204602551. The next prime is 204602597. The reversal of 204602561 is 165206402.

204602561 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204602561 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 204602561.

It is not an unprimeable number, because it can be changed into a prime (204602551) 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, 377225 + ... + 377766.

It is an arithmetic number, because the mean of its divisors is an integer number (51339456).

Almost surely, 2^204602561 is an apocalyptic number.

It is an amenable number.

204602561 is a deficient number, since it is larger than the sum of its proper divisors (755263).

204602561 is an equidigital number, since it uses as much as digits as its factorization.

204602561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755262.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 204602561 is about 14303.9351578508. The cubic root of 204602561 is about 589.2555592192.

Adding to 204602561 its reverse (165206402), we get a palindrome (369808963).

The spelling of 204602561 in words is "two hundred four million, six hundred two thousand, five hundred sixty-one".