205243411 has 4 divisors (see below), whose sum is σ = 212320800. Its totient is φ = 198166024.

The previous prime is 205243393. The next prime is 205243481. The reversal of 205243411 is 114342502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 114342502 = 2 ⋅57171251.

It is a cyclic number.

It is not a de Polignac number, because 205243411 - 2⁹ = 205242899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205243481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3538651 + ... + 3538708.

It is an arithmetic number, because the mean of its divisors is an integer number (53080200).

Almost surely, 2^205243411 is an apocalyptic number.

205243411 is a deficient number, since it is larger than the sum of its proper divisors (7077389).

205243411 is an equidigital number, since it uses as much as digits as its factorization.

205243411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7077388.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 205243411 is about 14326.3188223633. The cubic root of 205243411 is about 589.8701342056.

Adding to 205243411 its reverse (114342502), we get a palindrome (319585913).

Subtracting from 205243411 its reverse (114342502), we obtain a palindrome (90900909).

The spelling of 205243411 in words is "two hundred five million, two hundred forty-three thousand, four hundred eleven".