205434653 has 4 divisors (see below), whose sum is σ = 205606908. Its totient is φ = 205262400.

The previous prime is 205434611. The next prime is 205434709. The reversal of 205434653 is 356434502.

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 95981209 + 109453444 = 9797^2 + 10462^2 .

It is a cyclic number.

It is not a de Polignac number, because 205434653 - 2¹⁰ = 205433629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205434253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84326 + ... + 86727.

It is an arithmetic number, because the mean of its divisors is an integer number (51401727).

Almost surely, 2^205434653 is an apocalyptic number.

It is an amenable number.

205434653 is a deficient number, since it is larger than the sum of its proper divisors (172255).

205434653 is a wasteful number, since it uses less digits than its factorization.

205434653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172254.

The product of its (nonzero) digits is 43200, while the sum is 32.

The square root of 205434653 is about 14332.9917672480. The cubic root of 205434653 is about 590.0532873445.

The spelling of 205434653 in words is "two hundred five million, four hundred thirty-four thousand, six hundred fifty-three".