204243101 has 2 divisors, whose sum is σ = 204243102. Its totient is φ = 204243100.

The previous prime is 204243047. The next prime is 204243113. The reversal of 204243101 is 101342402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102535876 + 101707225 = 10126^2 + 10085^2 .

It is a cyclic number.

It is not a de Polignac number, because 204243101 - 2²⁶ = 137134237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204243101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204243121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102121550 + 102121551.

It is an arithmetic number, because the mean of its divisors is an integer number (102121551).

Almost surely, 2^204243101 is an apocalyptic number.

It is an amenable number.

204243101 is a deficient number, since it is larger than the sum of its proper divisors (1).

204243101 is an equidigital number, since it uses as much as digits as its factorization.

204243101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 204243101 is about 14291.3645604610. The cubic root of 204243101 is about 588.9102752264.

Adding to 204243101 its reverse (101342402), we get a palindrome (305585503).

The spelling of 204243101 in words is "two hundred four million, two hundred forty-three thousand, one hundred one".