205155135 has 24 divisors (see below), whose sum is σ = 367866720. Its totient is φ = 105642432.

The previous prime is 205155079. The next prime is 205155143. The reversal of 205155135 is 531551502.

It is not a de Polignac number, because 205155135 - 2¹² = 205151039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205155099 and 205155108.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 77299 + ... + 79908.

It is an arithmetic number, because the mean of its divisors is an integer number (15327780).

Almost surely, 2^205155135 is an apocalyptic number.

205155135 is a deficient number, since it is larger than the sum of its proper divisors (162711585).

205155135 is a wasteful number, since it uses less digits than its factorization.

205155135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157247 (or 157244 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 205155135 is about 14323.2375879198. The cubic root of 205155135 is about 589.7855535884.

The spelling of 205155135 in words is "two hundred five million, one hundred fifty-five thousand, one hundred thirty-five".