1216522123 has 2 divisors, whose sum is σ = 1216522124. Its totient is φ = 1216522122.

The previous prime is 1216522061. The next prime is 1216522133. The reversal of 1216522123 is 3212256121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216522123 - 2⁹ = 1216521611 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216522133) 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, 608261061 + 608261062.

It is an arithmetic number, because the mean of its divisors is an integer number (608261062).

Almost surely, 2^1216522123 is an apocalyptic number.

1216522123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216522123 is an equidigital number, since it uses as much as digits as its factorization.

1216522123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 1216522123 is about 34878.6771968204. The cubic root of 1216522123 is about 1067.5134045013.

Adding to 1216522123 its reverse (3212256121), we get a palindrome (4428778244).

The spelling of 1216522123 in words is "one billion, two hundred sixteen million, five hundred twenty-two thousand, one hundred twenty-three".