204504401 has 2 divisors, whose sum is σ = 204504402. Its totient is φ = 204504400.

The previous prime is 204504397. The next prime is 204504481. The reversal of 204504401 is 104405402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143976001 + 60528400 = 11999^2 + 7780^2 .

It is a cyclic number.

It is not a de Polignac number, because 204504401 - 2² = 204504397 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204504481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102252200 + 102252201.

It is an arithmetic number, because the mean of its divisors is an integer number (102252201).

Almost surely, 2^204504401 is an apocalyptic number.

It is an amenable number.

204504401 is a deficient number, since it is larger than the sum of its proper divisors (1).

204504401 is an equidigital number, since it uses as much as digits as its factorization.

204504401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 204504401 is about 14300.5035226037. The cubic root of 204504401 is about 589.1613105160.

Adding to 204504401 its reverse (104405402), we get a palindrome (308909803).

The spelling of 204504401 in words is "two hundred four million, five hundred four thousand, four hundred one".