205909411 has 2 divisors, whose sum is σ = 205909412. Its totient is φ = 205909410.

The previous prime is 205909381. The next prime is 205909427. The reversal of 205909411 is 114909502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205909411 is a prime.

It is not a weakly prime, because it can be changed into another prime (205900411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102954705 + 102954706.

It is an arithmetic number, because the mean of its divisors is an integer number (102954706).

Almost surely, 2^205909411 is an apocalyptic number.

205909411 is a deficient number, since it is larger than the sum of its proper divisors (1).

205909411 is an equidigital number, since it uses as much as digits as its factorization.

205909411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 205909411 is about 14349.5439300348. The cubic root of 205909411 is about 590.5074739458.

Subtracting from 205909411 its reverse (114909502), we obtain a palindrome (90999909).

The spelling of 205909411 in words is "two hundred five million, nine hundred nine thousand, four hundred eleven".