205145 has 8 divisors (see below), whose sum is σ = 249480. Its totient is φ = 161920.

The previous prime is 205141. The next prime is 205151. The reversal of 205145 is 541502.

It can be written as a sum of positive squares in 4 ways, for example, as 841 + 204304 = 29^2 + 452^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205145 - 2² = 205141 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 205145.

It is not an unprimeable number, because it can be changed into a prime (205141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215 + ... + 675.

It is an arithmetic number, because the mean of its divisors is an integer number (31185).

2²⁰⁵¹⁴⁵ is an apocalyptic number.

It is an amenable number.

205145 is a deficient number, since it is larger than the sum of its proper divisors (44335).

205145 is an equidigital number, since it uses as much as digits as its factorization.

205145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 205145 is about 452.9293543148. The cubic root of 205145 is about 58.9775841304.

Adding to 205145 its reverse (541502), we get a palindrome (746647).

The spelling of 205145 in words is "two hundred five thousand, one hundred forty-five".