243243243181 has 2 divisors, whose sum is σ = 243243243182. Its totient is φ = 243243243180.

The previous prime is 243243243149. The next prime is 243243243203. The reversal of 243243243181 is 181342342342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215323840900 + 27919402281 = 464030^2 + 167091^2 .

It is a cyclic number.

It is not a de Polignac number, because 243243243181 - 2⁵ = 243243243149 is a prime.

It is a super-2 number, since 2×243243243181² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243243243181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243243243121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121621621590 + 121621621591.

It is an arithmetic number, because the mean of its divisors is an integer number (121621621591).

Almost surely, 2^243243243181 is an apocalyptic number.

It is an amenable number.

243243243181 is a deficient number, since it is larger than the sum of its proper divisors (1).

243243243181 is an equidigital number, since it uses as much as digits as its factorization.

243243243181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 37.

The spelling of 243243243181 in words is "two hundred forty-three billion, two hundred forty-three million, two hundred forty-three thousand, one hundred eighty-one".