1216961719097 has 2 divisors, whose sum is σ = 1216961719098. Its totient is φ = 1216961719096.

The previous prime is 1216961719091. The next prime is 1216961719111. The reversal of 1216961719097 is 7909171696121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1112594601616 + 104367117481 = 1054796^2 + 323059^2 .

It is an emirp because it is prime and its reverse (7909171696121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216961719097 - 2¹⁴ = 1216961702713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216961719091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608480859548 + 608480859549.

It is an arithmetic number, because the mean of its divisors is an integer number (608480859549).

Almost surely, 2^{1216961719097} is an apocalyptic number.

It is an amenable number.

1216961719097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216961719097 is an equidigital number, since it uses as much as digits as its factorization.

1216961719097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2571912, while the sum is 59.

The spelling of 1216961719097 in words is "one trillion, two hundred sixteen billion, nine hundred sixty-one million, seven hundred nineteen thousand, ninety-seven".