204251643 has 12 divisors (see below), whose sum is σ = 295164168. Its totient is φ = 136105920.

The previous prime is 204251609. The next prime is 204251647. The reversal of 204251643 is 346152402.

It is not a de Polignac number, because 204251643 - 2¹⁷ = 204120571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204251647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25123 + ... + 32243.

It is an arithmetic number, because the mean of its divisors is an integer number (24597014).

Almost surely, 2^204251643 is an apocalyptic number.

204251643 is a deficient number, since it is larger than the sum of its proper divisors (90912525).

204251643 is a wasteful number, since it uses less digits than its factorization.

204251643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10314 (or 10311 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 204251643 is about 14291.6634091347. The cubic root of 204251643 is about 588.9184850532.

The spelling of 204251643 in words is "two hundred four million, two hundred fifty-one thousand, six hundred forty-three".