205103047 has 2 divisors, whose sum is σ = 205103048. Its totient is φ = 205103046.

The previous prime is 205103027. The next prime is 205103069. The reversal of 205103047 is 740301502.

It is an a-pointer prime, because the next prime (205103069) can be obtained adding 205103047 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205103047 - 2¹¹ = 205100999 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205103027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102551523 + 102551524.

It is an arithmetic number, because the mean of its divisors is an integer number (102551524).

Almost surely, 2^205103047 is an apocalyptic number.

205103047 is a deficient number, since it is larger than the sum of its proper divisors (1).

205103047 is an equidigital number, since it uses as much as digits as its factorization.

205103047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 205103047 is about 14321.4191685042. The cubic root of 205103047 is about 589.7356346978.

Adding to 205103047 its reverse (740301502), we get a palindrome (945404549).

The spelling of 205103047 in words is "two hundred five million, one hundred three thousand, forty-seven".