205541047 has 4 divisors (see below), whose sum is σ = 205571520. Its totient is φ = 205510576.

The previous prime is 205541029. The next prime is 205541051. The reversal of 205541047 is 740145502.

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 a de Polignac number, because none of the positive numbers 2^k-205541047 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 (205541027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118 + ... + 20275.

It is an arithmetic number, because the mean of its divisors is an integer number (51392880).

Almost surely, 2^205541047 is an apocalyptic number.

205541047 is a deficient number, since it is larger than the sum of its proper divisors (30473).

205541047 is a wasteful number, since it uses less digits than its factorization.

205541047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30472.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 205541047 is about 14336.7027938784. The cubic root of 205541047 is about 590.1551320497.

Adding to 205541047 its reverse (740145502), we get a palindrome (945686549).

The spelling of 205541047 in words is "two hundred five million, five hundred forty-one thousand, forty-seven".