205423913 has 2 divisors, whose sum is σ = 205423914. Its totient is φ = 205423912.

The previous prime is 205423909. The next prime is 205423927. The reversal of 205423913 is 319324502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205406224 + 17689 = 14332^2 + 133^2 .

It is a cyclic number.

It is not a de Polignac number, because 205423913 - 2² = 205423909 is a prime.

It is not a weakly prime, because it can be changed into another prime (205423993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102711956 + 102711957.

It is an arithmetic number, because the mean of its divisors is an integer number (102711957).

Almost surely, 2^205423913 is an apocalyptic number.

It is an amenable number.

205423913 is a deficient number, since it is larger than the sum of its proper divisors (1).

205423913 is an equidigital number, since it uses as much as digits as its factorization.

205423913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 205423913 is about 14332.6171022601. The cubic root of 205423913 is about 590.0430046217.

The spelling of 205423913 in words is "two hundred five million, four hundred twenty-three thousand, nine hundred thirteen".