205364261 has 4 divisors (see below), whose sum is σ = 205551552. Its totient is φ = 205176972.

The previous prime is 205364231. The next prime is 205364281. The reversal of 205364261 is 162463502.

205364261 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 162463502 = 2 ⋅81231751.

It is a cyclic number.

It is not a de Polignac number, because 205364261 - 2¹⁰ = 205363237 is a prime.

It is a super-2 number, since 2×205364261² = 84348959392152242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205364231) 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, 91991 + ... + 94196.

It is an arithmetic number, because the mean of its divisors is an integer number (51387888).

Almost surely, 2^205364261 is an apocalyptic number.

It is an amenable number.

205364261 is a deficient number, since it is larger than the sum of its proper divisors (187291).

205364261 is a wasteful number, since it uses less digits than its factorization.

205364261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187290.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 205364261 is about 14330.5359634593. The cubic root of 205364261 is about 589.9858859019.

The spelling of 205364261 in words is "two hundred five million, three hundred sixty-four thousand, two hundred sixty-one".