204543551 has 4 divisors (see below), whose sum is σ = 204903600. Its totient is φ = 204183504.

The previous prime is 204543527. The next prime is 204543667. The reversal of 204543551 is 155345402.

204543551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204543551 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 (204543751) 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, 179171 + ... + 180308.

It is an arithmetic number, because the mean of its divisors is an integer number (51225900).

Almost surely, 2^204543551 is an apocalyptic number.

204543551 is a deficient number, since it is larger than the sum of its proper divisors (360049).

204543551 is an equidigital number, since it uses as much as digits as its factorization.

204543551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360048.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 204543551 is about 14301.8722900185. The cubic root of 204543551 is about 589.1989041545.

Adding to 204543551 its reverse (155345402), we get a palindrome (359888953).

The spelling of 204543551 in words is "two hundred four million, five hundred forty-three thousand, five hundred fifty-one".