243400111061 has 2 divisors, whose sum is σ = 243400111062. Its totient is φ = 243400111060.

The previous prime is 243400111039. The next prime is 243400111079. The reversal of 243400111061 is 160111004342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146130352900 + 97269758161 = 382270^2 + 311881^2 .

It is a cyclic number.

It is not a de Polignac number, because 243400111061 - 2²⁶ = 243333002197 is a prime.

It is a super-2 number, since 2×243400111061² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243400111001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121700055530 + 121700055531.

It is an arithmetic number, because the mean of its divisors is an integer number (121700055531).

Almost surely, 2^243400111061 is an apocalyptic number.

It is an amenable number.

243400111061 is a deficient number, since it is larger than the sum of its proper divisors (1).

243400111061 is an equidigital number, since it uses as much as digits as its factorization.

243400111061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 243400111061 in words is "two hundred forty-three billion, four hundred million, one hundred eleven thousand, sixty-one".