205147 has 4 divisors (see below), whose sum is σ = 206176. Its totient is φ = 204120.

The previous prime is 205141. The next prime is 205151. The reversal of 205147 is 741502.

205147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 205147 - 2⁷ = 205019 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 108 + ... + 649.

It is an arithmetic number, because the mean of its divisors is an integer number (51544).

2²⁰⁵¹⁴⁷ is an apocalyptic number.

205147 is the 262-nd hex number.

205147 is a deficient number, since it is larger than the sum of its proper divisors (1029).

205147 is an equidigital number, since it uses as much as digits as its factorization.

205147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 205147 is about 452.9315621592. The cubic root of 205147 is about 58.9777757912.

Adding to 205147 its reverse (741502), we get a palindrome (946649).

It can be divided in two parts, 205 and 147, that multiplied together give a triangular number (30135 = T₂₄₅).

The spelling of 205147 in words is "two hundred five thousand, one hundred forty-seven".