1101128789 has 2 divisors, whose sum is σ = 1101128790. Its totient is φ = 1101128788.

The previous prime is 1101128783. The next prime is 1101128803. The reversal of 1101128789 is 9878211011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 890007889 + 211120900 = 29833^2 + 14530^2 .

It is an emirp because it is prime and its reverse (9878211011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1101128789 - 2⁸ = 1101128533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101128783) 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, 550564394 + 550564395.

It is an arithmetic number, because the mean of its divisors is an integer number (550564395).

Almost surely, 2^1101128789 is an apocalyptic number.

It is an amenable number.

1101128789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101128789 is an equidigital number, since it uses as much as digits as its factorization.

1101128789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 38.

The square root of 1101128789 is about 33183.2606746233. The cubic root of 1101128789 is about 1032.6330936661.

The spelling of 1101128789 in words is "one billion, one hundred one million, one hundred twenty-eight thousand, seven hundred eighty-nine".