1128319909 has 2 divisors, whose sum is σ = 1128319910. Its totient is φ = 1128319908.

The previous prime is 1128319891. The next prime is 1128319919. The reversal of 1128319909 is 9099138211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1051704900 + 76615009 = 32430^2 + 8753^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128319909 - 2⁷ = 1128319781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1128319919) 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, 564159954 + 564159955.

It is an arithmetic number, because the mean of its divisors is an integer number (564159955).

Almost surely, 2^1128319909 is an apocalyptic number.

It is an amenable number.

1128319909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128319909 is an equidigital number, since it uses as much as digits as its factorization.

1128319909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 1128319909 is about 33590.4734857965. The cubic root of 1128319909 is about 1041.0639718451.

The spelling of 1128319909 in words is "one billion, one hundred twenty-eight million, three hundred nineteen thousand, nine hundred nine".