1216304401511 has 2 divisors, whose sum is σ = 1216304401512. Its totient is φ = 1216304401510.

The previous prime is 1216304401483. The next prime is 1216304401531. The reversal of 1216304401511 is 1151044036121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216304401511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216304401531) 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, 608152200755 + 608152200756.

It is an arithmetic number, because the mean of its divisors is an integer number (608152200756).

Almost surely, 2^{1216304401511} is an apocalyptic number.

1216304401511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216304401511 is an equidigital number, since it uses as much as digits as its factorization.

1216304401511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 1216304401511 its reverse (1151044036121), we get a palindrome (2367348437632).

The spelling of 1216304401511 in words is "one trillion, two hundred sixteen billion, three hundred four million, four hundred one thousand, five hundred eleven".