1121216689 has 2 divisors, whose sum is σ = 1121216690. Its totient is φ = 1121216688.

The previous prime is 1121216687. The next prime is 1121216713. The reversal of 1121216689 is 9866121211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 923673664 + 197543025 = 30392^2 + 14055^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121216689 - 2¹ = 1121216687 is a prime.

Together with 1121216687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1121216687) 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, 560608344 + 560608345.

It is an arithmetic number, because the mean of its divisors is an integer number (560608345).

Almost surely, 2^1121216689 is an apocalyptic number.

It is an amenable number.

1121216689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121216689 is an equidigital number, since it uses as much as digits as its factorization.

1121216689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 37.

The square root of 1121216689 is about 33484.5738960495. The cubic root of 1121216689 is about 1038.8747349031.

The spelling of 1121216689 in words is "one billion, one hundred twenty-one million, two hundred sixteen thousand, six hundred eighty-nine".