1128512909 has 2 divisors, whose sum is σ = 1128512910. Its totient is φ = 1128512908.

The previous prime is 1128512893. The next prime is 1128512953. The reversal of 1128512909 is 9092158211.

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., 1094617225 + 33895684 = 33085^2 + 5822^2 .

It is an emirp because it is prime and its reverse (9092158211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1128512909 - 2⁴ = 1128512893 is a prime.

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 (1128512009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564256454 + 564256455.

It is an arithmetic number, because the mean of its divisors is an integer number (564256455).

Almost surely, 2^1128512909 is an apocalyptic number.

It is an amenable number.

1128512909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128512909 is an equidigital number, since it uses as much as digits as its factorization.

1128512909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 1128512909 is about 33593.3462012941. The cubic root of 1128512909 is about 1041.1233267290.

The spelling of 1128512909 in words is "one billion, one hundred twenty-eight million, five hundred twelve thousand, nine hundred nine".