204131017 has 2 divisors, whose sum is σ = 204131018. Its totient is φ = 204131016.

The previous prime is 204131009. The next prime is 204131047. The reversal of 204131017 is 710131402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141705216 + 62425801 = 11904^2 + 7901^2 .

It is a cyclic number.

It is not a de Polignac number, because 204131017 - 2³ = 204131009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204130985 and 204131003.

It is not a weakly prime, because it can be changed into another prime (204131047) 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, 102065508 + 102065509.

It is an arithmetic number, because the mean of its divisors is an integer number (102065509).

Almost surely, 2^204131017 is an apocalyptic number.

It is an amenable number.

204131017 is a deficient number, since it is larger than the sum of its proper divisors (1).

204131017 is an equidigital number, since it uses as much as digits as its factorization.

204131017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 204131017 is about 14287.4426333057. The cubic root of 204131017 is about 588.8025286291.

Adding to 204131017 its reverse (710131402), we get a palindrome (914262419).

The spelling of 204131017 in words is "two hundred four million, one hundred thirty-one thousand, seventeen".