205319887 has 2 divisors, whose sum is σ = 205319888. Its totient is φ = 205319886.

The previous prime is 205319869. The next prime is 205319893. The reversal of 205319887 is 788913502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205319887 - 2¹⁵ = 205287119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205319857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102659943 + 102659944.

It is an arithmetic number, because the mean of its divisors is an integer number (102659944).

Almost surely, 2^205319887 is an apocalyptic number.

205319887 is a deficient number, since it is larger than the sum of its proper divisors (1).

205319887 is an equidigital number, since it uses as much as digits as its factorization.

205319887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 205319887 is about 14328.9876474230. The cubic root of 205319887 is about 589.9433891867.

The spelling of 205319887 in words is "two hundred five million, three hundred nineteen thousand, eight hundred eighty-seven".