243123503281 has 2 divisors, whose sum is σ = 243123503282. Its totient is φ = 243123503280.

The previous prime is 243123503257. The next prime is 243123503327. The reversal of 243123503281 is 182305321342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229401723681 + 13721779600 = 478959^2 + 117140^2 .

It is a cyclic number.

It is not a de Polignac number, because 243123503281 - 2¹⁷ = 243123372209 is a prime.

It is a super-2 number, since 2×243123503281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243123303281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121561751640 + 121561751641.

It is an arithmetic number, because the mean of its divisors is an integer number (121561751641).

Almost surely, 2^243123503281 is an apocalyptic number.

It is an amenable number.

243123503281 is a deficient number, since it is larger than the sum of its proper divisors (1).

243123503281 is an equidigital number, since it uses as much as digits as its factorization.

243123503281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 243123503281 in words is "two hundred forty-three billion, one hundred twenty-three million, five hundred three thousand, two hundred eighty-one".