205304961 has 4 divisors (see below), whose sum is σ = 273739952. Its totient is φ = 136869972.

The previous prime is 205304959. The next prime is 205305029. The reversal of 205304961 is 169403502.

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.

It is not a de Polignac number, because 205304961 - 2¹ = 205304959 is a prime.

It is a super-2 number, since 2×205304961² = 84300254022423042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205304941) 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, 34217491 + ... + 34217496.

It is an arithmetic number, because the mean of its divisors is an integer number (68434988).

Almost surely, 2^205304961 is an apocalyptic number.

It is an amenable number.

205304961 is a deficient number, since it is larger than the sum of its proper divisors (68434991).

205304961 is an equidigital number, since it uses as much as digits as its factorization.

205304961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68434990.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 205304961 is about 14328.4668056286. The cubic root of 205304961 is about 589.9290932694.

The spelling of 205304961 in words is "two hundred five million, three hundred four thousand, nine hundred sixty-one".