1128156889 has 2 divisors, whose sum is σ = 1128156890. Its totient is φ = 1128156888.

The previous prime is 1128156881. The next prime is 1128156947. The reversal of 1128156889 is 9886518211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 748569600 + 379587289 = 27360^2 + 19483^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128156889 - 2³ = 1128156881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1128156881) 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, 564078444 + 564078445.

It is an arithmetic number, because the mean of its divisors is an integer number (564078445).

Almost surely, 2^1128156889 is an apocalyptic number.

It is an amenable number.

1128156889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128156889 is an equidigital number, since it uses as much as digits as its factorization.

1128156889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 49.

The square root of 1128156889 is about 33588.0468172831. The cubic root of 1128156889 is about 1041.0138316849.

The spelling of 1128156889 in words is "one billion, one hundred twenty-eight million, one hundred fifty-six thousand, eight hundred eighty-nine".