205031423 has 2 divisors, whose sum is σ = 205031424. Its totient is φ = 205031422.

The previous prime is 205031417. The next prime is 205031483. The reversal of 205031423 is 324130502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205031423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205031395 and 205031404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205031483) 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, 102515711 + 102515712.

It is an arithmetic number, because the mean of its divisors is an integer number (102515712).

Almost surely, 2^205031423 is an apocalyptic number.

205031423 is a deficient number, since it is larger than the sum of its proper divisors (1).

205031423 is an equidigital number, since it uses as much as digits as its factorization.

205031423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 205031423 is about 14318.9183599879. The cubic root of 205031423 is about 589.6669795454. Note that the first 3 decimals are identical.

Adding to 205031423 its reverse (324130502), we get a palindrome (529161925).

The spelling of 205031423 in words is "two hundred five million, thirty-one thousand, four hundred twenty-three".