243161 has 2 divisors, whose sum is σ = 243162. Its totient is φ = 243160.

The previous prime is 243157. The next prime is 243167. The reversal of 243161 is 161342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175561 + 67600 = 419^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 243161 - 2² = 243157 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a nialpdrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243161.

It is not a weakly prime, because it can be changed into another prime (243167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121580 + 121581.

It is an arithmetic number, because the mean of its divisors is an integer number (121581).

2²⁴³¹⁶¹ is an apocalyptic number.

It is an amenable number.

243161 is a deficient number, since it is larger than the sum of its proper divisors (1).

243161 is an equidigital number, since it uses as much as digits as its factorization.

243161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 17.

The square root of 243161 is about 493.1135771808. The cubic root of 243161 is about 62.4162932743.

It can be divided in two parts, 243 and 161, that added together give a palindrome (404).

The spelling of 243161 in words is "two hundred forty-three thousand, one hundred sixty-one".