205145953 has 4 divisors (see below), whose sum is σ = 217213380. Its totient is φ = 193078528.

The previous prime is 205145939. The next prime is 205145959. The reversal of 205145953 is 359541502.

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 63250209 + 141895744 = 7953^2 + 11912^2 .

It is a cyclic number.

It is not a de Polignac number, because 205145953 - 2⁵ = 205145921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205145959) 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, 6033688 + ... + 6033721.

It is an arithmetic number, because the mean of its divisors is an integer number (54303345).

Almost surely, 2^205145953 is an apocalyptic number.

It is an amenable number.

205145953 is a deficient number, since it is larger than the sum of its proper divisors (12067427).

205145953 is a wasteful number, since it uses less digits than its factorization.

205145953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12067426.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 205145953 is about 14322.9170562424. The cubic root of 205145953 is about 589.7767545695.

The spelling of 205145953 in words is "two hundred five million, one hundred forty-five thousand, nine hundred fifty-three".