243121245181 has 2 divisors, whose sum is σ = 243121245182. Its totient is φ = 243121245180.

The previous prime is 243121245109. The next prime is 243121245233. The reversal of 243121245181 is 181542121342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232791775225 + 10329469956 = 482485^2 + 101634^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121245181 - 2⁹ = 243121244669 is a prime.

It is a super-2 number, since 2×243121245181² (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 (243121245281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560622590 + 121560622591.

It is an arithmetic number, because the mean of its divisors is an integer number (121560622591).

Almost surely, 2^243121245181 is an apocalyptic number.

It is an amenable number.

243121245181 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121245181 is an equidigital number, since it uses as much as digits as its factorization.

243121245181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 34.

The spelling of 243121245181 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, one hundred eighty-one".