243642112489 has 2 divisors, whose sum is σ = 243642112490. Its totient is φ = 243642112488.

The previous prime is 243642112481. The next prime is 243642112513. The reversal of 243642112489 is 984211246342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242391782889 + 1250329600 = 492333^2 + 35360^2 .

It is a cyclic number.

It is not a de Polignac number, because 243642112489 - 2³ = 243642112481 is a prime.

It is a super-2 number, since 2×243642112489² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243642112481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121821056244 + 121821056245.

It is an arithmetic number, because the mean of its divisors is an integer number (121821056245).

Almost surely, 2^243642112489 is an apocalyptic number.

It is an amenable number.

243642112489 is a deficient number, since it is larger than the sum of its proper divisors (1).

243642112489 is an equidigital number, since it uses as much as digits as its factorization.

243642112489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 46.

The spelling of 243642112489 in words is "two hundred forty-three billion, six hundred forty-two million, one hundred twelve thousand, four hundred eighty-nine".