243121134181 has 2 divisors, whose sum is σ = 243121134182. Its totient is φ = 243121134180.

The previous prime is 243121134163. The next prime is 243121134313. The reversal of 243121134181 is 181431121342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142701862081 + 100419272100 = 377759^2 + 316890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121134181 is a prime.

It is a super-2 number, since 2×243121134181² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121131181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560567090 + 121560567091.

It is an arithmetic number, because the mean of its divisors is an integer number (121560567091).

Almost surely, 2^243121134181 is an apocalyptic number.

It is an amenable number.

243121134181 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121134181 is an equidigital number, since it uses as much as digits as its factorization.

243121134181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 31.

The spelling of 243121134181 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred thirty-four thousand, one hundred eighty-one".