204129049 has 4 divisors (see below), whose sum is σ = 204469300. Its totient is φ = 203788800.

The previous prime is 204129043. The next prime is 204129059. The reversal of 204129049 is 940921402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 185913225 + 18215824 = 13635^2 + 4268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204129049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204129049.

It is not an unprimeable number, because it can be changed into a prime (204129043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169224 + ... + 170425.

It is an arithmetic number, because the mean of its divisors is an integer number (51117325).

Almost surely, 2^204129049 is an apocalyptic number.

It is an amenable number.

204129049 is a deficient number, since it is larger than the sum of its proper divisors (340251).

204129049 is an equidigital number, since it uses as much as digits as its factorization.

204129049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340250.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 204129049 is about 14287.3737614721. The cubic root of 204129049 is about 588.8006364341.

The spelling of 204129049 in words is "two hundred four million, one hundred twenty-nine thousand, forty-nine".