205161953 has 4 divisors (see below), whose sum is σ = 205191168. Its totient is φ = 205132740.

The previous prime is 205161949. The next prime is 205161959. The reversal of 205161953 is 359161502.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 205161953 - 2² = 205161949 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205161959) 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 3 ways as a sum of consecutive naturals, for example, 3008 + ... + 20478.

It is an arithmetic number, because the mean of its divisors is an integer number (51297792).

Almost surely, 2^205161953 is an apocalyptic number.

It is an amenable number.

205161953 is a deficient number, since it is larger than the sum of its proper divisors (29215).

205161953 is a wasteful number, since it uses less digits than its factorization.

205161953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29214.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 205161953 is about 14323.4755907915. The cubic root of 205161953 is about 589.7920870399.

The spelling of 205161953 in words is "two hundred five million, one hundred sixty-one thousand, nine hundred fifty-three".