243539937031639 has 2 divisors, whose sum is σ = 243539937031640. Its totient is φ = 243539937031638.

The previous prime is 243539937031607. The next prime is 243539937031649. The reversal of 243539937031639 is 936130739935342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243539937031639 - 2⁵ = 243539937031607 is a prime.

It is a super-3 number, since 3×243539937031639³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243539937031649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121769968515819 + 121769968515820.

It is an arithmetic number, because the mean of its divisors is an integer number (121769968515820).

Almost surely, 2^{243539937031639} is an apocalyptic number.

243539937031639 is a deficient number, since it is larger than the sum of its proper divisors (1).

243539937031639 is an equidigital number, since it uses as much as digits as its factorization.

243539937031639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 297606960, while the sum is 67.

The spelling of 243539937031639 in words is "two hundred forty-three trillion, five hundred thirty-nine billion, nine hundred thirty-seven million, thirty-one thousand, six hundred thirty-nine".