1220111489 has 2 divisors, whose sum is σ = 1220111490. Its totient is φ = 1220111488.

The previous prime is 1220111449. The next prime is 1220111551. The reversal of 1220111489 is 9841110221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 653671489 + 566440000 = 25567^2 + 23800^2 .

It is an emirp because it is prime and its reverse (9841110221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220111489 - 2²⁰ = 1219062913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220111419) 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, 610055744 + 610055745.

It is an arithmetic number, because the mean of its divisors is an integer number (610055745).

Almost surely, 2^1220111489 is an apocalyptic number.

It is an amenable number.

1220111489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220111489 is an equidigital number, since it uses as much as digits as its factorization.

1220111489 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1220111489 is about 34930.0943170785. The cubic root of 1220111489 is about 1068.5622781495.

The spelling of 1220111489 in words is "one billion, two hundred twenty million, one hundred eleven thousand, four hundred eighty-nine".