243320511493 has 2 divisors, whose sum is σ = 243320511494. Its totient is φ = 243320511492.

The previous prime is 243320511487. The next prime is 243320511557. The reversal of 243320511493 is 394115023342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243308387169 + 12124324 = 493263^2 + 3482^2 .

It is a cyclic number.

It is not a de Polignac number, because 243320511493 - 2⁹ = 243320510981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243320511793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121660255746 + 121660255747.

It is an arithmetic number, because the mean of its divisors is an integer number (121660255747).

Almost surely, 2^243320511493 is an apocalyptic number.

It is an amenable number.

243320511493 is a deficient number, since it is larger than the sum of its proper divisors (1).

243320511493 is an equidigital number, since it uses as much as digits as its factorization.

243320511493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 243320511493 in words is "two hundred forty-three billion, three hundred twenty million, five hundred eleven thousand, four hundred ninety-three".