243563161 has 2 divisors, whose sum is σ = 243563162. Its totient is φ = 243563160.

The previous prime is 243563087. The next prime is 243563183. The reversal of 243563161 is 161365342.

243563161 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., 157351936 + 86211225 = 12544^2 + 9285^2 .

It is a cyclic number.

It is not a de Polignac number, because 243563161 - 2²¹ = 241466009 is a prime.

It is not a weakly prime, because it can be changed into another prime (243563561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121781580 + 121781581.

It is an arithmetic number, because the mean of its divisors is an integer number (121781581).

Almost surely, 2^243563161 is an apocalyptic number.

It is an amenable number.

243563161 is a deficient number, since it is larger than the sum of its proper divisors (1).

243563161 is an equidigital number, since it uses as much as digits as its factorization.

243563161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 243563161 is about 15606.5102120878. The cubic root of 243563161 is about 624.5068416942.

The spelling of 243563161 in words is "two hundred forty-three million, five hundred sixty-three thousand, one hundred sixty-one".