205388471 has 2 divisors, whose sum is σ = 205388472. Its totient is φ = 205388470.

The previous prime is 205388467. The next prime is 205388473. The reversal of 205388471 is 174883502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205388471 - 2² = 205388467 is a prime.

It is a super-3 number, since 3×205388471³ (a number of 26 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 205388473, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205388473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102694235 + 102694236.

It is an arithmetic number, because the mean of its divisors is an integer number (102694236).

Almost surely, 2^205388471 is an apocalyptic number.

205388471 is a deficient number, since it is larger than the sum of its proper divisors (1).

205388471 is an equidigital number, since it uses as much as digits as its factorization.

205388471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 205388471 is about 14331.3806383056. The cubic root of 205388471 is about 590.0090690936.

The spelling of 205388471 in words is "two hundred five million, three hundred eighty-eight thousand, four hundred seventy-one".