205411211 has 4 divisors (see below), whose sum is σ = 205615800. Its totient is φ = 205206624.

The previous prime is 205411207. The next prime is 205411231. The reversal of 205411211 is 112114502.

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 205411211 - 2² = 205411207 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 205411211.

It is not an unprimeable number, because it can be changed into a prime (205411201) 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, 100781 + ... + 102798.

It is an arithmetic number, because the mean of its divisors is an integer number (51403950).

Almost surely, 2^205411211 is an apocalyptic number.

205411211 is a deficient number, since it is larger than the sum of its proper divisors (204589).

205411211 is a wasteful number, since it uses less digits than its factorization.

205411211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204588.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 205411211 is about 14332.1739802446. The cubic root of 205411211 is about 590.0308429725.

Adding to 205411211 its reverse (112114502), we get a palindrome (317525713).

The spelling of 205411211 in words is "two hundred five million, four hundred eleven thousand, two hundred eleven".