204611261 has 4 divisors (see below), whose sum is σ = 204639900. Its totient is φ = 204582624.

The previous prime is 204611249. The next prime is 204611273. The reversal of 204611261 is 162116402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (204611249) and next prime (204611273).

It can be written as a sum of positive squares in 2 ways, for example, as 54671236 + 149940025 = 7394^2 + 12245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204611261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204611161) 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, 6185 + ... + 21153.

It is an arithmetic number, because the mean of its divisors is an integer number (51159975).

Almost surely, 2^204611261 is an apocalyptic number.

It is an amenable number.

204611261 is a deficient number, since it is larger than the sum of its proper divisors (28639).

204611261 is a wasteful number, since it uses less digits than its factorization.

204611261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28638.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 204611261 is about 14304.2392667349. The cubic root of 204611261 is about 589.2639111034.

Adding to 204611261 its reverse (162116402), we get a palindrome (366727663).

The spelling of 204611261 in words is "two hundred four million, six hundred eleven thousand, two hundred sixty-one".