205262591 has 2 divisors, whose sum is σ = 205262592. Its totient is φ = 205262590.

The previous prime is 205262537. The next prime is 205262611. The reversal of 205262591 is 195262502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205262591 - 2⁶ = 205262527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205262531) 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, 102631295 + 102631296.

It is an arithmetic number, because the mean of its divisors is an integer number (102631296).

Almost surely, 2^205262591 is an apocalyptic number.

205262591 is a deficient number, since it is larger than the sum of its proper divisors (1).

205262591 is an equidigital number, since it uses as much as digits as its factorization.

205262591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 205262591 is about 14326.9882040853. The cubic root of 205262591 is about 589.8885080911. Note that the first 3 decimals are identical.

The spelling of 205262591 in words is "two hundred five million, two hundred sixty-two thousand, five hundred ninety-one".