1216522133 has 2 divisors, whose sum is σ = 1216522134. Its totient is φ = 1216522132.

The previous prime is 1216522123. The next prime is 1216522147. The reversal of 1216522133 is 3312256121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 908238769 + 308283364 = 30137^2 + 17558^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216522133 - 2¹⁴ = 1216505749 is a prime.

It is a super-2 number, since 2×1216522133² = 2959852200157739378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216522123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608261066 + 608261067.

It is an arithmetic number, because the mean of its divisors is an integer number (608261067).

Almost surely, 2^1216522133 is an apocalyptic number.

It is an amenable number.

1216522133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216522133 is an equidigital number, since it uses as much as digits as its factorization.

1216522133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 1216522133 is about 34878.6773401745. The cubic root of 1216522133 is about 1067.5134074263.

Adding to 1216522133 its reverse (3312256121), we get a palindrome (4528778254).

The spelling of 1216522133 in words is "one billion, two hundred sixteen million, five hundred twenty-two thousand, one hundred thirty-three".