1171423789 has 2 divisors, whose sum is σ = 1171423790. Its totient is φ = 1171423788.

The previous prime is 1171423769. The next prime is 1171423823. The reversal of 1171423789 is 9873241711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1169298025 + 2125764 = 34195^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 1171423789 - 2²⁵ = 1137869357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1171423769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585711894 + 585711895.

It is an arithmetic number, because the mean of its divisors is an integer number (585711895).

Almost surely, 2^1171423789 is an apocalyptic number.

It is an amenable number.

1171423789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171423789 is an equidigital number, since it uses as much as digits as its factorization.

1171423789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 43.

The square root of 1171423789 is about 34226.0688510965. The cubic root of 1171423789 is about 1054.1555018671.

The spelling of 1171423789 in words is "one billion, one hundred seventy-one million, four hundred twenty-three thousand, seven hundred eighty-nine".