204129949 has 2 divisors, whose sum is σ = 204129950. Its totient is φ = 204129948.

The previous prime is 204129943. The next prime is 204129967. The reversal of 204129949 is 949921402.

204129949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137053849 + 67076100 = 11707^2 + 8190^2 .

It is a cyclic number.

It is not a de Polignac number, because 204129949 - 2³ = 204129941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204129941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102064974 + 102064975.

It is an arithmetic number, because the mean of its divisors is an integer number (102064975).

Almost surely, 2^204129949 is an apocalyptic number.

It is an amenable number.

204129949 is a deficient number, since it is larger than the sum of its proper divisors (1).

204129949 is an equidigital number, since it uses as much as digits as its factorization.

204129949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 204129949 is about 14287.4052577786. The cubic root of 204129949 is about 588.8015017687.

The spelling of 204129949 in words is "two hundred four million, one hundred twenty-nine thousand, nine hundred forty-nine".