204130261 has 2 divisors, whose sum is σ = 204130262. Its totient is φ = 204130260.

The previous prime is 204130249. The next prime is 204130291. The reversal of 204130261 is 162031402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135140625 + 68989636 = 11625^2 + 8306^2 .

It is a cyclic number.

It is not a de Polignac number, because 204130261 - 2¹⁹ = 203605973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204130211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102065130 + 102065131.

It is an arithmetic number, because the mean of its divisors is an integer number (102065131).

Almost surely, 2^204130261 is an apocalyptic number.

It is an amenable number.

204130261 is a deficient number, since it is larger than the sum of its proper divisors (1).

204130261 is an equidigital number, since it uses as much as digits as its factorization.

204130261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 204130261 is about 14287.4161764820. The cubic root of 204130261 is about 588.8018017508.

Adding to 204130261 its reverse (162031402), we get a palindrome (366161663).

The spelling of 204130261 in words is "two hundred four million, one hundred thirty thousand, two hundred sixty-one".