205655311 has 2 divisors, whose sum is σ = 205655312. Its totient is φ = 205655310.

The previous prime is 205655267. The next prime is 205655363. The reversal of 205655311 is 113556502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205655311 - 2¹¹ = 205653263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205655311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205655371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102827655 + 102827656.

It is an arithmetic number, because the mean of its divisors is an integer number (102827656).

Almost surely, 2^205655311 is an apocalyptic number.

205655311 is a deficient number, since it is larger than the sum of its proper divisors (1).

205655311 is an equidigital number, since it uses as much as digits as its factorization.

205655311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 205655311 is about 14340.6872568925. The cubic root of 205655311 is about 590.2644711088.

The spelling of 205655311 in words is "two hundred five million, six hundred fifty-five thousand, three hundred eleven".