243661873387 has 2 divisors, whose sum is σ = 243661873388. Its totient is φ = 243661873386.

The previous prime is 243661873309. The next prime is 243661873391. The reversal of 243661873387 is 783378166342.

243661873387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243661873387 - 2¹¹ = 243661871339 is a prime.

It is a super-2 number, since 2×243661873387² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243661873187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121830936693 + 121830936694.

It is an arithmetic number, because the mean of its divisors is an integer number (121830936694).

Almost surely, 2^243661873387 is an apocalyptic number.

243661873387 is a deficient number, since it is larger than the sum of its proper divisors (1).

243661873387 is an equidigital number, since it uses as much as digits as its factorization.

243661873387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24385536, while the sum is 58.

The spelling of 243661873387 in words is "two hundred forty-three billion, six hundred sixty-one million, eight hundred seventy-three thousand, three hundred eighty-seven".