1123642789 has 2 divisors, whose sum is σ = 1123642790. Its totient is φ = 1123642788.

The previous prime is 1123642781. The next prime is 1123642801. The reversal of 1123642789 is 9872463211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1098392164 + 25250625 = 33142^2 + 5025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123642789 - 2³ = 1123642781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123642781) 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, 561821394 + 561821395.

It is an arithmetic number, because the mean of its divisors is an integer number (561821395).

Almost surely, 2^1123642789 is an apocalyptic number.

It is an amenable number.

1123642789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123642789 is an equidigital number, since it uses as much as digits as its factorization.

1123642789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 1123642789 is about 33520.7814497216. The cubic root of 1123642789 is about 1039.6235043135.

The spelling of 1123642789 in words is "one billion, one hundred twenty-three million, six hundred forty-two thousand, seven hundred eighty-nine".