1128129449 has 2 divisors, whose sum is σ = 1128129450. Its totient is φ = 1128129448.

The previous prime is 1128129407. The next prime is 1128129481. The reversal of 1128129449 is 9449218211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1064847424 + 63282025 = 32632^2 + 7955^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128129449 - 2⁸ = 1128129193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1128129749) 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, 564064724 + 564064725.

It is an arithmetic number, because the mean of its divisors is an integer number (564064725).

Almost surely, 2^1128129449 is an apocalyptic number.

It is an amenable number.

1128129449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128129449 is an equidigital number, since it uses as much as digits as its factorization.

1128129449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 41.

The square root of 1128129449 is about 33587.6383361498. The cubic root of 1128129449 is about 1041.0053914726.

The spelling of 1128129449 in words is "one billion, one hundred twenty-eight million, one hundred twenty-nine thousand, four hundred forty-nine".