1243312163 has 2 divisors, whose sum is σ = 1243312164. Its totient is φ = 1243312162.

The previous prime is 1243312069. The next prime is 1243312171. The reversal of 1243312163 is 3612133421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243312163 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243312183) 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, 621656081 + 621656082.

It is an arithmetic number, because the mean of its divisors is an integer number (621656082).

Almost surely, 2^1243312163 is an apocalyptic number.

1243312163 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243312163 is an equidigital number, since it uses as much as digits as its factorization.

1243312163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 1243312163 is about 35260.6319143602. The cubic root of 1243312163 is about 1075.2927741953.

Adding to 1243312163 its reverse (3612133421), we get a palindrome (4855445584).

The spelling of 1243312163 in words is "one billion, two hundred forty-three million, three hundred twelve thousand, one hundred sixty-three".