1220313643 has 2 divisors, whose sum is σ = 1220313644. Its totient is φ = 1220313642.

The previous prime is 1220313631. The next prime is 1220313659. The reversal of 1220313643 is 3463130221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220313643 - 2⁹ = 1220313131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220313623) 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, 610156821 + 610156822.

It is an arithmetic number, because the mean of its divisors is an integer number (610156822).

Almost surely, 2^1220313643 is an apocalyptic number.

1220313643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220313643 is an equidigital number, since it uses as much as digits as its factorization.

1220313643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 1220313643 is about 34932.9878911037. The cubic root of 1220313643 is about 1068.6212897540.

Adding to 1220313643 its reverse (3463130221), we get a palindrome (4683443864).

The spelling of 1220313643 in words is "one billion, two hundred twenty million, three hundred thirteen thousand, six hundred forty-three".