243123345481 has 2 divisors, whose sum is σ = 243123345482. Its totient is φ = 243123345480.

The previous prime is 243123345397. The next prime is 243123345541. The reversal of 243123345481 is 184543321342.

243123345481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221197139856 + 21926205625 = 470316^2 + 148075^2 .

It is a cyclic number.

It is not a de Polignac number, because 243123345481 - 2¹¹ = 243123343433 is a prime.

It is a super-2 number, since 2×243123345481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243123345781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121561672740 + 121561672741.

It is an arithmetic number, because the mean of its divisors is an integer number (121561672741).

Almost surely, 2^243123345481 is an apocalyptic number.

It is an amenable number.

243123345481 is a deficient number, since it is larger than the sum of its proper divisors (1).

243123345481 is an equidigital number, since it uses as much as digits as its factorization.

243123345481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 40.

The spelling of 243123345481 in words is "two hundred forty-three billion, one hundred twenty-three million, three hundred forty-five thousand, four hundred eighty-one".