1243220243 has 2 divisors, whose sum is σ = 1243220244. Its totient is φ = 1243220242.

The previous prime is 1243220213. The next prime is 1243220269. The reversal of 1243220243 is 3420223421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1243220243 - 2⁸ = 1243219987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243220203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621610121 + 621610122.

It is an arithmetic number, because the mean of its divisors is an integer number (621610122).

Almost surely, 2^1243220243 is an apocalyptic number.

1243220243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243220243 is an equidigital number, since it uses as much as digits as its factorization.

1243220243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 1243220243 is about 35259.3284536164. The cubic root of 1243220243 is about 1075.2662741871.

Adding to 1243220243 its reverse (3420223421), we get a palindrome (4663443664).

The spelling of 1243220243 in words is "one billion, two hundred forty-three million, two hundred twenty thousand, two hundred forty-three".