204769129 has 4 divisors (see below), whose sum is σ = 209763540. Its totient is φ = 199774720.

The previous prime is 204769127. The next prime is 204769133. The reversal of 204769129 is 921967402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 921967402 = 2 ⋅460983701.

It can be written as a sum of positive squares in 2 ways, for example, as 83174400 + 121594729 = 9120^2 + 11027^2 .

It is a cyclic number.

It is not a de Polignac number, because 204769129 - 2¹ = 204769127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204769091 and 204769100.

It is not an unprimeable number, because it can be changed into a prime (204769121) 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 in 3 ways as a sum of consecutive naturals, for example, 2497144 + ... + 2497225.

It is an arithmetic number, because the mean of its divisors is an integer number (52440885).

Almost surely, 2^204769129 is an apocalyptic number.

It is an amenable number.

204769129 is a deficient number, since it is larger than the sum of its proper divisors (4994411).

204769129 is an equidigital number, since it uses as much as digits as its factorization.

204769129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4994410.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 204769129 is about 14309.7564269976. The cubic root of 204769129 is about 589.4154211753.

The spelling of 204769129 in words is "two hundred four million, seven hundred sixty-nine thousand, one hundred twenty-nine".