1128249989 has 2 divisors, whose sum is σ = 1128249990. Its totient is φ = 1128249988.

The previous prime is 1128249973. The next prime is 1128250021. The reversal of 1128249989 is 9899428211.

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., 872729764 + 255520225 = 29542^2 + 15985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128249989 - 2⁴ = 1128249973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1128249989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1128249589) 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, 564124994 + 564124995.

It is an arithmetic number, because the mean of its divisors is an integer number (564124995).

Almost surely, 2^1128249989 is an apocalyptic number.

It is an amenable number.

1128249989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128249989 is an equidigital number, since it uses as much as digits as its factorization.

1128249989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 53.

The square root of 1128249989 is about 33589.4326983949. The cubic root of 1128249989 is about 1041.0424670999.

The spelling of 1128249989 in words is "one billion, one hundred twenty-eight million, two hundred forty-nine thousand, nine hundred eighty-nine".