204404131 has 2 divisors, whose sum is σ = 204404132. Its totient is φ = 204404130.

The previous prime is 204404129. The next prime is 204404191. The reversal of 204404131 is 131404402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204404131 - 2¹ = 204404129 is a prime.

It is a super-2 number, since 2×204404131² = 83562097539730322, which contains 22 as substring.

Together with 204404129, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 204404099 and 204404108.

It is not a weakly prime, because it can be changed into another prime (204404191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102202065 + 102202066.

It is an arithmetic number, because the mean of its divisors is an integer number (102202066).

Almost surely, 2^204404131 is an apocalyptic number.

204404131 is a deficient number, since it is larger than the sum of its proper divisors (1).

204404131 is an equidigital number, since it uses as much as digits as its factorization.

204404131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 204404131 is about 14296.9972721547. The cubic root of 204404131 is about 589.0650047447.

Adding to 204404131 its reverse (131404402), we get a palindrome (335808533).

The spelling of 204404131 in words is "two hundred four million, four hundred four thousand, one hundred thirty-one".