1028751109 has 2 divisors, whose sum is σ = 1028751110. Its totient is φ = 1028751108.

The previous prime is 1028751103. The next prime is 1028751121. The reversal of 1028751109 is 9011578201.

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., 870545025 + 158206084 = 29505^2 + 12578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028751109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028751103) 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, 514375554 + 514375555.

It is an arithmetic number, because the mean of its divisors is an integer number (514375555).

Almost surely, 2^1028751109 is an apocalyptic number.

It is an amenable number.

1028751109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028751109 is an equidigital number, since it uses as much as digits as its factorization.

1028751109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 1028751109 is about 32074.1501680091. The cubic root of 1028751109 is about 1009.4932951600.

The spelling of 1028751109 in words is "one billion, twenty-eight million, seven hundred fifty-one thousand, one hundred nine".