1220450243 has 2 divisors, whose sum is σ = 1220450244. Its totient is φ = 1220450242.

The previous prime is 1220450227. The next prime is 1220450249. The reversal of 1220450243 is 3420540221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220450243 - 2⁴ = 1220450227 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220450249) 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, 610225121 + 610225122.

It is an arithmetic number, because the mean of its divisors is an integer number (610225122).

Almost surely, 2^1220450243 is an apocalyptic number.

1220450243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220450243 is an equidigital number, since it uses as much as digits as its factorization.

1220450243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 1220450243 is about 34934.9430083978. The cubic root of 1220450243 is about 1068.6611615314.

Adding to 1220450243 its reverse (3420540221), we get a palindrome (4640990464).

The spelling of 1220450243 in words is "one billion, two hundred twenty million, four hundred fifty thousand, two hundred forty-three".