243321503431 has 2 divisors, whose sum is σ = 243321503432. Its totient is φ = 243321503430.

The previous prime is 243321503429. The next prime is 243321503437. The reversal of 243321503431 is 134305123342.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243321503431 - 2¹ = 243321503429 is a prime.

It is a super-2 number, since 2×243321503431² (a number of 24 digits) contains 22 as substring.

Together with 243321503429, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 243321503393 and 243321503402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243321503437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121660751715 + 121660751716.

It is an arithmetic number, because the mean of its divisors is an integer number (121660751716).

Almost surely, 2^243321503431 is an apocalyptic number.

243321503431 is a deficient number, since it is larger than the sum of its proper divisors (1).

243321503431 is an equidigital number, since it uses as much as digits as its factorization.

243321503431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 31.

Adding to 243321503431 its reverse (134305123342), we get a palindrome (377626626773).

The spelling of 243321503431 in words is "two hundred forty-three billion, three hundred twenty-one million, five hundred three thousand, four hundred thirty-one".