205443149 has 2 divisors, whose sum is σ = 205443150. Its totient is φ = 205443148.

The previous prime is 205443083. The next prime is 205443151. The reversal of 205443149 is 941344502.

205443149 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 can be written as a sum of positive squares in only one way, i.e., 205348900 + 94249 = 14330^2 + 307^2 .

It is a cyclic number.

It is not a de Polignac number, because 205443149 - 2²⁰ = 204394573 is a prime.

Together with 205443151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205443349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102721574 + 102721575.

It is an arithmetic number, because the mean of its divisors is an integer number (102721575).

Almost surely, 2^205443149 is an apocalyptic number.

It is an amenable number.

205443149 is a deficient number, since it is larger than the sum of its proper divisors (1).

205443149 is an equidigital number, since it uses as much as digits as its factorization.

205443149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 205443149 is about 14333.2881433396. The cubic root of 205443149 is about 590.0614213562.

The spelling of 205443149 in words is "two hundred five million, four hundred forty-three thousand, one hundred forty-nine".