205111523 has 2 divisors, whose sum is σ = 205111524. Its totient is φ = 205111522.

The previous prime is 205111481. The next prime is 205111583. The reversal of 205111523 is 325111502.

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-205111523 is a prime.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 205111495 and 205111504.

It is not a weakly prime, because it can be changed into another prime (205111583) 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, 102555761 + 102555762.

It is an arithmetic number, because the mean of its divisors is an integer number (102555762).

Almost surely, 2^205111523 is an apocalyptic number.

205111523 is a deficient number, since it is larger than the sum of its proper divisors (1).

205111523 is an equidigital number, since it uses as much as digits as its factorization.

205111523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 205111523 is about 14321.7150858408. The cubic root of 205111523 is about 589.7437583060.

The spelling of 205111523 in words is "two hundred five million, one hundred eleven thousand, five hundred twenty-three".