205431404203 has 4 divisors (see below), whose sum is σ = 205432452360. Its totient is φ = 205430356048.

The previous prime is 205431404201. The next prime is 205431404251. The reversal of 205431404203 is 302404134502.

It is a happy number.

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 205431404203 - 2¹ = 205431404201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205431404201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132625 + ... + 654562.

It is an arithmetic number, because the mean of its divisors is an integer number (51358113090).

Almost surely, 2^205431404203 is an apocalyptic number.

205431404203 is a deficient number, since it is larger than the sum of its proper divisors (1048157).

205431404203 is an equidigital number, since it uses as much as digits as its factorization.

205431404203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048156.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 205431404203 its reverse (302404134502), we get a palindrome (507835538705).

The spelling of 205431404203 in words is "two hundred five billion, four hundred thirty-one million, four hundred four thousand, two hundred three".