243561142579 has 2 divisors, whose sum is σ = 243561142580. Its totient is φ = 243561142578.

The previous prime is 243561142547. The next prime is 243561142597. The reversal of 243561142579 is 975241165342.

Together with next prime (243561142597) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243561142579 - 2⁵ = 243561142547 is a prime.

It is a super-3 number, since 3×243561142579³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (243561142379) 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, 121780571289 + 121780571290.

It is an arithmetic number, because the mean of its divisors is an integer number (121780571290).

Almost surely, 2^243561142579 is an apocalyptic number.

243561142579 is a deficient number, since it is larger than the sum of its proper divisors (1).

243561142579 is an equidigital number, since it uses as much as digits as its factorization.

243561142579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 49.

The spelling of 243561142579 in words is "two hundred forty-three billion, five hundred sixty-one million, one hundred forty-two thousand, five hundred seventy-nine".