243948326431 has 2 divisors, whose sum is σ = 243948326432. Its totient is φ = 243948326430.

The previous prime is 243948326387. The next prime is 243948326441. The reversal of 243948326431 is 134623849342.

243948326431 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 243948326431 - 2²³ = 243939937823 is a prime.

It is a super-2 number, since 2×243948326431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243948326441) 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, 121974163215 + 121974163216.

It is an arithmetic number, because the mean of its divisors is an integer number (121974163216).

Almost surely, 2^243948326431 is an apocalyptic number.

243948326431 is a deficient number, since it is larger than the sum of its proper divisors (1).

243948326431 is an equidigital number, since it uses as much as digits as its factorization.

243948326431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 49.

The spelling of 243948326431 in words is "two hundred forty-three billion, nine hundred forty-eight million, three hundred twenty-six thousand, four hundred thirty-one".