1968749789 has 2 divisors, whose sum is σ = 1968749790. Its totient is φ = 1968749788.

The previous prime is 1968749773. The next prime is 1968749803. The reversal of 1968749789 is 9879478691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1923524164 + 45225625 = 43858^2 + 6725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1968749789 - 2⁴ = 1968749773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1968749729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984374894 + 984374895.

It is an arithmetic number, because the mean of its divisors is an integer number (984374895).

Almost surely, 2^1968749789 is an apocalyptic number.

It is an amenable number.

1968749789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968749789 is an equidigital number, since it uses as much as digits as its factorization.

1968749789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54867456, while the sum is 68.

The square root of 1968749789 is about 44370.5959955464. The cubic root of 1968749789 is about 1253.3244389663.

The spelling of 1968749789 in words is "one billion, nine hundred sixty-eight million, seven hundred forty-nine thousand, seven hundred eighty-nine".