1243320343 has 2 divisors, whose sum is σ = 1243320344. Its totient is φ = 1243320342.

The previous prime is 1243320319. The next prime is 1243320373. The reversal of 1243320343 is 3430233421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1243320343 - 2²⁵ = 1209765911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243320373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621660171 + 621660172.

It is an arithmetic number, because the mean of its divisors is an integer number (621660172).

Almost surely, 2^1243320343 is an apocalyptic number.

1243320343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243320343 is an equidigital number, since it uses as much as digits as its factorization.

1243320343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 25.

The square root of 1243320343 is about 35260.7479075530. The cubic root of 1243320343 is about 1075.2951323791.

Adding to 1243320343 its reverse (3430233421), we get a palindrome (4673553764).

The spelling of 1243320343 in words is "one billion, two hundred forty-three million, three hundred twenty thousand, three hundred forty-three".