205135211 has 4 divisors (see below), whose sum is σ = 205255992. Its totient is φ = 205014432.

The previous prime is 205135207. The next prime is 205135237. The reversal of 205135211 is 112531502.

It is a happy number.

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 205135211 - 2² = 205135207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205135201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57806 + ... + 61251.

It is an arithmetic number, because the mean of its divisors is an integer number (51313998).

Almost surely, 2^205135211 is an apocalyptic number.

205135211 is a deficient number, since it is larger than the sum of its proper divisors (120781).

205135211 is a wasteful number, since it uses less digits than its factorization.

205135211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120780.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 205135211 is about 14322.5420578890. The cubic root of 205135211 is about 589.7664602849.

Adding to 205135211 its reverse (112531502), we get a palindrome (317666713).

The spelling of 205135211 in words is "two hundred five million, one hundred thirty-five thousand, two hundred eleven".