1121849181989 has 2 divisors, whose sum is σ = 1121849181990. Its totient is φ = 1121849181988.

The previous prime is 1121849181983. The next prime is 1121849182007. The reversal of 1121849181989 is 9891819481211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648459772900 + 473389409089 = 805270^2 + 688033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121849181989 is a prime.

It is a super-2 number, since 2×1121849181989² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121849181983) by changing a digit.

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 as a sum of consecutive naturals, namely, 560924590994 + 560924590995.

It is an arithmetic number, because the mean of its divisors is an integer number (560924590995).

Almost surely, 2^{1121849181989} is an apocalyptic number.

It is an amenable number.

1121849181989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121849181989 is an equidigital number, since it uses as much as digits as its factorization.

1121849181989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 62.

The spelling of 1121849181989 in words is "one trillion, one hundred twenty-one billion, eight hundred forty-nine million, one hundred eighty-one thousand, nine hundred eighty-nine".