205262891 has 2 divisors, whose sum is σ = 205262892. Its totient is φ = 205262890.

The previous prime is 205262839. The next prime is 205262923. The reversal of 205262891 is 198262502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205262891 - 2²² = 201068587 is a prime.

It is not a weakly prime, because it can be changed into another prime (205262801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102631445 + 102631446.

It is an arithmetic number, because the mean of its divisors is an integer number (102631446).

Almost surely, 2^205262891 is an apocalyptic number.

205262891 is a deficient number, since it is larger than the sum of its proper divisors (1).

205262891 is an equidigital number, since it uses as much as digits as its factorization.

205262891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 205262891 is about 14326.9986738326. The cubic root of 205262891 is about 589.8887954733. Note that the first 3 decimals are identical.

The spelling of 205262891 in words is "two hundred five million, two hundred sixty-two thousand, eight hundred ninety-one".