205012135 has 4 divisors (see below), whose sum is σ = 246014568. Its totient is φ = 164009704.

The previous prime is 205012121. The next prime is 205012141. The reversal of 205012135 is 531210502.

205012135 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205012135 - 2⁹ = 205011623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20501209 + ... + 20501218.

It is an arithmetic number, because the mean of its divisors is an integer number (61503642).

Almost surely, 2^205012135 is an apocalyptic number.

205012135 is a deficient number, since it is larger than the sum of its proper divisors (41002433).

205012135 is an equidigital number, since it uses as much as digits as its factorization.

205012135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41002432.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 205012135 is about 14318.2448295872. The cubic root of 205012135 is about 589.6484883093.

Adding to 205012135 its reverse (531210502), we get a palindrome (736222637).

The spelling of 205012135 in words is "two hundred five million, twelve thousand, one hundred thirty-five".