1128865489 has 2 divisors, whose sum is σ = 1128865490. Its totient is φ = 1128865488.

The previous prime is 1128865483. The next prime is 1128865537. The reversal of 1128865489 is 9845688211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 713317264 + 415548225 = 26708^2 + 20385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128865489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1128865483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564432744 + 564432745.

It is an arithmetic number, because the mean of its divisors is an integer number (564432745).

Almost surely, 2^1128865489 is an apocalyptic number.

It is an amenable number.

1128865489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128865489 is an equidigital number, since it uses as much as digits as its factorization.

1128865489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1105920, while the sum is 52.

The square root of 1128865489 is about 33598.5935568738. The cubic root of 1128865489 is about 1041.2317410967.

The spelling of 1128865489 in words is "one billion, one hundred twenty-eight million, eight hundred sixty-five thousand, four hundred eighty-nine".