204511243 has 4 divisors (see below), whose sum is σ = 204550920. Its totient is φ = 204471568.

The previous prime is 204511217. The next prime is 204511261. The reversal of 204511243 is 342115402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342115402 = 2 ⋅171057701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204511243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204511273) 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, 10705 + ... + 22882.

It is an arithmetic number, because the mean of its divisors is an integer number (51137730).

Almost surely, 2^204511243 is an apocalyptic number.

204511243 is a deficient number, since it is larger than the sum of its proper divisors (39677).

204511243 is an equidigital number, since it uses as much as digits as its factorization.

204511243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39676.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 204511243 is about 14300.7427429487. The cubic root of 204511243 is about 589.1678808664.

Adding to 204511243 its reverse (342115402), we get a palindrome (546626645).

The spelling of 204511243 in words is "two hundred four million, five hundred eleven thousand, two hundred forty-three".