205205135 has 16 divisors (see below), whose sum is σ = 253272096. Its totient is φ = 159539328.

The previous prime is 205205069. The next prime is 205205171. The reversal of 205205135 is 531502502.

It is not a de Polignac number, because 205205135 - 2²⁶ = 138096271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205205135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24737 + ... + 31973.

It is an arithmetic number, because the mean of its divisors is an integer number (15829506).

Almost surely, 2^205205135 is an apocalyptic number.

205205135 is a deficient number, since it is larger than the sum of its proper divisors (48066961).

205205135 is a wasteful number, since it uses less digits than its factorization.

205205135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7402.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 205205135 is about 14324.9828970229. The cubic root of 205205135 is about 589.8334634824.

Adding to 205205135 its reverse (531502502), we get a palindrome (736707637).

The spelling of 205205135 in words is "two hundred five million, two hundred five thousand, one hundred thirty-five".