205741891 has 2 divisors, whose sum is σ = 205741892. Its totient is φ = 205741890.

The previous prime is 205741843. The next prime is 205741931. The reversal of 205741891 is 198147502.

205741891 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 205741891 - 2⁷ = 205741763 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205741891.

It is not a weakly prime, because it can be changed into another prime (205741801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102870945 + 102870946.

It is an arithmetic number, because the mean of its divisors is an integer number (102870946).

Almost surely, 2^205741891 is an apocalyptic number.

205741891 is a deficient number, since it is larger than the sum of its proper divisors (1).

205741891 is an equidigital number, since it uses as much as digits as its factorization.

205741891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 205741891 is about 14343.7056230250. The cubic root of 205741891 is about 590.3472924206.

The spelling of 205741891 in words is "two hundred five million, seven hundred forty-one thousand, eight hundred ninety-one".