205595161 has 4 divisors (see below), whose sum is σ = 217689012. Its totient is φ = 193501312.

The previous prime is 205595153. The next prime is 205595167. The reversal of 205595161 is 161595502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 132595225 + 72999936 = 11515^2 + 8544^2 .

It is a cyclic number.

It is not a de Polignac number, because 205595161 - 2³ = 205595153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205595167) 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, 6046900 + ... + 6046933.

It is an arithmetic number, because the mean of its divisors is an integer number (54422253).

Almost surely, 2^205595161 is an apocalyptic number.

It is an amenable number.

205595161 is a deficient number, since it is larger than the sum of its proper divisors (12093851).

205595161 is a wasteful number, since it uses less digits than its factorization.

205595161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12093850.

The product of its (nonzero) digits is 13500, while the sum is 34.

The square root of 205595161 is about 14338.5899236989. The cubic root of 205595161 is about 590.2069187092.

The spelling of 205595161 in words is "two hundred five million, five hundred ninety-five thousand, one hundred sixty-one".