1128238289 has 2 divisors, whose sum is σ = 1128238290. Its totient is φ = 1128238288.

The previous prime is 1128238231. The next prime is 1128238403. The reversal of 1128238289 is 9828328211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1122786064 + 5452225 = 33508^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128238289 - 2¹⁶ = 1128172753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1128238589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564119144 + 564119145.

It is an arithmetic number, because the mean of its divisors is an integer number (564119145).

Almost surely, 2^1128238289 is an apocalyptic number.

It is an amenable number.

1128238289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128238289 is an equidigital number, since it uses as much as digits as its factorization.

1128238289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 44.

The square root of 1128238289 is about 33589.2585360261. The cubic root of 1128238289 is about 1041.0388685360.

The spelling of 1128238289 in words is "one billion, one hundred twenty-eight million, two hundred thirty-eight thousand, two hundred eighty-nine".