243742600531 has 2 divisors, whose sum is σ = 243742600532. Its totient is φ = 243742600530.

The previous prime is 243742600513. The next prime is 243742600567. The reversal of 243742600531 is 135006247342.

Together with previous prime (243742600513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243742600531 - 2³⁷ = 106303647059 is a prime.

It is a super-2 number, since 2×243742600531² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243742600831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121871300265 + 121871300266.

It is an arithmetic number, because the mean of its divisors is an integer number (121871300266).

Almost surely, 2^243742600531 is an apocalyptic number.

243742600531 is a deficient number, since it is larger than the sum of its proper divisors (1).

243742600531 is an equidigital number, since it uses as much as digits as its factorization.

243742600531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 37.

Adding to 243742600531 its reverse (135006247342), we get a palindrome (378748847873).

The spelling of 243742600531 in words is "two hundred forty-three billion, seven hundred forty-two million, six hundred thousand, five hundred thirty-one".