205145311 has 6 divisors (see below), whose sum is σ = 238638480. Its totient is φ = 175838796.

The previous prime is 205145249. The next prime is 205145323. The reversal of 205145311 is 113541502.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-205145311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205145371) 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, 2093271 + ... + 2093368.

It is an arithmetic number, because the mean of its divisors is an integer number (39773080).

Almost surely, 2^205145311 is an apocalyptic number.

205145311 is a deficient number, since it is larger than the sum of its proper divisors (33493169).

205145311 is an equidigital number, since it uses as much as digits as its factorization.

205145311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4186653 (or 4186646 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 205145311 is about 14322.8946445891. The cubic root of 205145311 is about 589.7761393375.

Adding to 205145311 its reverse (113541502), we get a palindrome (318686813).

The spelling of 205145311 in words is "two hundred five million, one hundred forty-five thousand, three hundred eleven".