205459811 has 6 divisors (see below), whose sum is σ = 206852436. Its totient is φ = 204076500.

The previous prime is 205459783. The next prime is 205459819. The reversal of 205459811 is 118954502.

205459811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-205459811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205459819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18296 + ... + 27306.

It is an arithmetic number, because the mean of its divisors is an integer number (34475406).

Almost surely, 2^205459811 is an apocalyptic number.

205459811 is a deficient number, since it is larger than the sum of its proper divisors (1392625).

205459811 is an frugal number, since it uses more digits than its factorization.

205459811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9313 (or 9162 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 205459811 is about 14333.8693659458. The cubic root of 205459811 is about 590.0773727888.

The spelling of 205459811 in words is "two hundred five million, four hundred fifty-nine thousand, eight hundred eleven".