205315431323 has 4 divisors (see below), whose sum is σ = 208681258128. Its totient is φ = 201949604520.

The previous prime is 205315431313. The next prime is 205315431337. The reversal of 205315431323 is 323134513502.

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 205315431323 - 2¹⁸ = 205315169179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205315431323.

It is not an unprimeable number, because it can be changed into a prime (205315431313) 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, 1682913311 + ... + 1682913432.

It is an arithmetic number, because the mean of its divisors is an integer number (52170314532).

Almost surely, 2^205315431323 is an apocalyptic number.

205315431323 is a deficient number, since it is larger than the sum of its proper divisors (3365826805).

205315431323 is an equidigital number, since it uses as much as digits as its factorization.

205315431323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3365826804.

The product of its (nonzero) digits is 32400, while the sum is 32.

Adding to 205315431323 its reverse (323134513502), we get a palindrome (528449944825).

The spelling of 205315431323 in words is "two hundred five billion, three hundred fifteen million, four hundred thirty-one thousand, three hundred twenty-three".