205512103 has 4 divisors (see below), whose sum is σ = 205562448. Its totient is φ = 205461760.

The previous prime is 205512077. The next prime is 205512119. The reversal of 205512103 is 301215502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205512103 - 2¹⁷ = 205381031 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 (205512403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18451 + ... + 27412.

It is an arithmetic number, because the mean of its divisors is an integer number (51390612).

Almost surely, 2^205512103 is an apocalyptic number.

205512103 is a deficient number, since it is larger than the sum of its proper divisors (50345).

205512103 is an equidigital number, since it uses as much as digits as its factorization.

205512103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50344.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 205512103 is about 14335.6933212175. The cubic root of 205512103 is about 590.1274291452.

Adding to 205512103 its reverse (301215502), we get a palindrome (506727605).

The spelling of 205512103 in words is "two hundred five million, five hundred twelve thousand, one hundred three".