1281216116 has 12 divisors (see below), whose sum is σ = 2246536740. Its totient is φ = 639348480.

The previous prime is 1281216077. The next prime is 1281216121. The reversal of 1281216116 is 6116121821.

It can be written as a sum of positive squares in 2 ways, for example, as 1169913616 + 111302500 = 34204^2 + 10550^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312605 + ... + 316676.

It is an arithmetic number, because the mean of its divisors is an integer number (187211395).

Almost surely, 2^1281216116 is an apocalyptic number.

It is an amenable number.

1281216116 is a deficient number, since it is larger than the sum of its proper divisors (965320624).

1281216116 is a wasteful number, since it uses less digits than its factorization.

1281216116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629794 (or 629792 counting only the distinct ones).

The product of its digits is 1152, while the sum is 29.

The square root of 1281216116 is about 35794.0793428187. The cubic root of 1281216116 is about 1086.1107968270.

Adding to 1281216116 its reverse (6116121821), we get a palindrome (7397337937).

The spelling of 1281216116 in words is "one billion, two hundred eighty-one million, two hundred sixteen thousand, one hundred sixteen".