1128130561 has 2 divisors, whose sum is σ = 1128130562. Its totient is φ = 1128130560.

The previous prime is 1128130559. The next prime is 1128130571. The reversal of 1128130561 is 1650318211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 989479936 + 138650625 = 31456^2 + 11775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128130561 - 2¹ = 1128130559 is a prime.

Together with 1128130559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1128130511) 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, 564065280 + 564065281.

It is an arithmetic number, because the mean of its divisors is an integer number (564065281).

Almost surely, 2^1128130561 is an apocalyptic number.

It is an amenable number.

1128130561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128130561 is an equidigital number, since it uses as much as digits as its factorization.

1128130561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1128130561 is about 33587.6548898550. The cubic root of 1128130561 is about 1041.0057335130.

Adding to 1128130561 its reverse (1650318211), we get a palindrome (2778448772).

The spelling of 1128130561 in words is "one billion, one hundred twenty-eight million, one hundred thirty thousand, five hundred sixty-one".