205315145 has 12 divisors (see below), whose sum is σ = 286603524. Its totient is φ = 140787360.

The previous prime is 205315133. The next prime is 205315169. The reversal of 205315145 is 541513502.

205315145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 146991376 + 58323769 = 12124^2 + 7637^2 .

It is not a de Polignac number, because 205315145 - 2¹² = 205311049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 418766 + ... + 419255.

It is an arithmetic number, because the mean of its divisors is an integer number (23883627).

Almost surely, 2^205315145 is an apocalyptic number.

It is an amenable number.

205315145 is a deficient number, since it is larger than the sum of its proper divisors (81288379).

205315145 is an equidigital number, since it uses as much as digits as its factorization.

205315145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838040 (or 838033 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 205315145 is about 14328.8221776949. The cubic root of 205315145 is about 589.9388474395.

Adding to 205315145 its reverse (541513502), we get a palindrome (746828647).

The spelling of 205315145 in words is "two hundred five million, three hundred fifteen thousand, one hundred forty-five".