1216304401441 has 2 divisors, whose sum is σ = 1216304401442. Its totient is φ = 1216304401440.

The previous prime is 1216304401387. The next prime is 1216304401483. The reversal of 1216304401441 is 1441044036121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1049403555216 + 166900846225 = 1024404^2 + 408535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216304401441 - 2¹⁷ = 1216304270369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216304401141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608152200720 + 608152200721.

It is an arithmetic number, because the mean of its divisors is an integer number (608152200721).

Almost surely, 2^{1216304401441} is an apocalyptic number.

It is an amenable number.

1216304401441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216304401441 is an equidigital number, since it uses as much as digits as its factorization.

1216304401441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 1216304401441 its reverse (1441044036121), we get a palindrome (2657348437562).

The spelling of 1216304401441 in words is "one trillion, two hundred sixteen billion, three hundred four million, four hundred one thousand, four hundred forty-one".