1320220243 has 2 divisors, whose sum is σ = 1320220244. Its totient is φ = 1320220242.

The previous prime is 1320220241. The next prime is 1320220247. The reversal of 1320220243 is 3420220231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1320220243 - 2¹ = 1320220241 is a prime.

Together with 1320220241, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1320220243.

It is not a weakly prime, because it can be changed into another prime (1320220241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660110121 + 660110122.

It is an arithmetic number, because the mean of its divisors is an integer number (660110122).

Almost surely, 2^1320220243 is an apocalyptic number.

1320220243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320220243 is an equidigital number, since it uses as much as digits as its factorization.

1320220243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 1320220243 is about 36334.8351172810. The cubic root of 1320220243 is about 1097.0223167022.

Adding to 1320220243 its reverse (3420220231), we get a palindrome (4740440474).

The spelling of 1320220243 in words is "one billion, three hundred twenty million, two hundred twenty thousand, two hundred forty-three".