205675891 has 2 divisors, whose sum is σ = 205675892. Its totient is φ = 205675890.

The previous prime is 205675871. The next prime is 205675903. The reversal of 205675891 is 198576502.

205675891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205675891 - 2⁷ = 205675763 is a prime.

It is not a weakly prime, because it can be changed into another prime (205675831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102837945 + 102837946.

It is an arithmetic number, because the mean of its divisors is an integer number (102837946).

Almost surely, 2^205675891 is an apocalyptic number.

205675891 is a deficient number, since it is larger than the sum of its proper divisors (1).

205675891 is an equidigital number, since it uses as much as digits as its factorization.

205675891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 205675891 is about 14341.4047777754. The cubic root of 205675891 is about 590.2841597771.

The spelling of 205675891 in words is "two hundred five million, six hundred seventy-five thousand, eight hundred ninety-one".