1243344020309 has 2 divisors, whose sum is σ = 1243344020310. Its totient is φ = 1243344020308.

The previous prime is 1243344020263. The next prime is 1243344020357. The reversal of 1243344020309 is 9030204433421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1014713728900 + 228630291409 = 1007330^2 + 478153^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243344020309 - 2¹⁶ = 1243343954773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243344020389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621672010154 + 621672010155.

It is an arithmetic number, because the mean of its divisors is an integer number (621672010155).

Almost surely, 2^{1243344020309} is an apocalyptic number.

It is an amenable number.

1243344020309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243344020309 is an equidigital number, since it uses as much as digits as its factorization.

1243344020309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 35.

The spelling of 1243344020309 in words is "one trillion, two hundred forty-three billion, three hundred forty-four million, twenty thousand, three hundred nine".