205134005 has 4 divisors (see below), whose sum is σ = 246160812. Its totient is φ = 164107200.

The previous prime is 205134001. The next prime is 205134011. The reversal of 205134005 is 500431502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500431502 = 2 ⋅250215751.

It can be written as a sum of positive squares in 2 ways, for example, as 78818884 + 126315121 = 8878^2 + 11239^2 .

It is not a de Polignac number, because 205134005 - 2² = 205134001 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 (205134001) 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, 20513396 + ... + 20513405.

It is an arithmetic number, because the mean of its divisors is an integer number (61540203).

Almost surely, 2^205134005 is an apocalyptic number.

It is an amenable number.

205134005 is a deficient number, since it is larger than the sum of its proper divisors (41026807).

205134005 is an equidigital number, since it uses as much as digits as its factorization.

205134005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41026806.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 205134005 is about 14322.4999563624. The cubic root of 205134005 is about 589.7653045273.

Adding to 205134005 its reverse (500431502), we get a palindrome (705565507).

The spelling of 205134005 in words is "two hundred five million, one hundred thirty-four thousand, five".