9812311643 has 2 divisors, whose sum is σ = 9812311644. Its totient is φ = 9812311642.

The previous prime is 9812311637. The next prime is 9812311661. The reversal of 9812311643 is 3461132189.

It is a weak prime.

It is an emirp because it is prime and its reverse (3461132189) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9812311643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9812311597 and 9812311606.

It is not a weakly prime, because it can be changed into another prime (9812311603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4906155821 + 4906155822.

It is an arithmetic number, because the mean of its divisors is an integer number (4906155822).

Almost surely, 2^9812311643 is an apocalyptic number.

9812311643 is a deficient number, since it is larger than the sum of its proper divisors (1).

9812311643 is an equidigital number, since it uses as much as digits as its factorization.

9812311643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 9812311643 is about 99057.1130358643. The cubic root of 9812311643 is about 2140.8707292407.

The spelling of 9812311643 in words is "nine billion, eight hundred twelve million, three hundred eleven thousand, six hundred forty-three".