204649543 has 6 divisors (see below), whose sum is σ = 233928456. Its totient is φ = 175381452.

The previous prime is 204649499. The next prime is 204649559. The reversal of 204649543 is 345946402.

It is a happy number.

It is not a de Polignac number, because 204649543 - 2¹³ = 204641351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204619543) 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 5 ways as a sum of consecutive naturals, for example, 35146 + ... + 40552.

It is an arithmetic number, because the mean of its divisors is an integer number (38988076).

Almost surely, 2^204649543 is an apocalyptic number.

204649543 is a deficient number, since it is larger than the sum of its proper divisors (29278913).

204649543 is an frugal number, since it uses more digits than its factorization.

204649543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10821 (or 5414 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 204649543 is about 14305.5773389262. The cubic root of 204649543 is about 589.3006585014.

The spelling of 204649543 in words is "two hundred four million, six hundred forty-nine thousand, five hundred forty-three".