243045233281 has 2 divisors, whose sum is σ = 243045233282. Its totient is φ = 243045233280.

The previous prime is 243045233257. The next prime is 243045233287. The reversal of 243045233281 is 182332540342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242448896881 + 596336400 = 492391^2 + 24420^2 .

It is a cyclic number.

It is not a de Polignac number, because 243045233281 - 2⁷ = 243045233153 is a prime.

It is a super-2 number, since 2×243045233281² (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 243045233281.

It is not a weakly prime, because it can be changed into another prime (243045233287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121522616640 + 121522616641.

It is an arithmetic number, because the mean of its divisors is an integer number (121522616641).

Almost surely, 2^243045233281 is an apocalyptic number.

It is an amenable number.

243045233281 is a deficient number, since it is larger than the sum of its proper divisors (1).

243045233281 is an equidigital number, since it uses as much as digits as its factorization.

243045233281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 243045233281 in words is "two hundred forty-three billion, forty-five million, two hundred thirty-three thousand, two hundred eighty-one".