205316261 has 8 divisors (see below), whose sum is σ = 216361920. Its totient is φ = 194294592.

The previous prime is 205316249. The next prime is 205316263. The reversal of 205316261 is 162613502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205316261 - 2⁶ = 205316197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205316261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205316263) 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 7 ways as a sum of consecutive naturals, for example, 13181 + ... + 24173.

It is an arithmetic number, because the mean of its divisors is an integer number (27045240).

Almost surely, 2^205316261 is an apocalyptic number.

It is an amenable number.

205316261 is a deficient number, since it is larger than the sum of its proper divisors (11045659).

205316261 is a wasteful number, since it uses less digits than its factorization.

205316261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11995.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 205316261 is about 14328.8611201309. The cubic root of 205316261 is about 589.9399163176.

Adding to 205316261 its reverse (162613502), we get a palindrome (367929763).

The spelling of 205316261 in words is "two hundred five million, three hundred sixteen thousand, two hundred sixty-one".