1212311536643 has 2 divisors, whose sum is σ = 1212311536644. Its totient is φ = 1212311536642.

The previous prime is 1212311536573. The next prime is 1212311536649. The reversal of 1212311536643 is 3466351132121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212311536643 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212311536597 and 1212311536606.

It is not a weakly prime, because it can be changed into another prime (1212311536649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606155768321 + 606155768322.

It is an arithmetic number, because the mean of its divisors is an integer number (606155768322).

Almost surely, 2^{1212311536643} is an apocalyptic number.

1212311536643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212311536643 is an equidigital number, since it uses as much as digits as its factorization.

1212311536643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

Adding to 1212311536643 its reverse (3466351132121), we get a palindrome (4678662668764).

The spelling of 1212311536643 in words is "one trillion, two hundred twelve billion, three hundred eleven million, five hundred thirty-six thousand, six hundred forty-three".