204149643 has 4 divisors (see below), whose sum is σ = 272199528. Its totient is φ = 136099760.

The previous prime is 204149641. The next prime is 204149653. The reversal of 204149643 is 346941402.

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

It is a cyclic number.

It is not a de Polignac number, because 204149643 - 2¹ = 204149641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204149641) 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, 34024938 + ... + 34024943.

It is an arithmetic number, because the mean of its divisors is an integer number (68049882).

Almost surely, 2^204149643 is an apocalyptic number.

204149643 is a deficient number, since it is larger than the sum of its proper divisors (68049885).

204149643 is an equidigital number, since it uses as much as digits as its factorization.

204149643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68049884.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 204149643 is about 14288.0944495758. The cubic root of 204149643 is about 588.8204365762.

The spelling of 204149643 in words is "two hundred four million, one hundred forty-nine thousand, six hundred forty-three".