1123456678889 has 4 divisors (see below), whose sum is σ = 1124320213380. Its totient is φ = 1122593144400.

The previous prime is 1123456678873. The next prime is 1123456678943. The reversal of 1123456678889 is 9888766543211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40847643664 + 1082609035225 = 202108^2 + 1040485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123456678889 - 2⁴ = 1123456678873 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1123456678829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431765294 + ... + 431767895.

It is an arithmetic number, because the mean of its divisors is an integer number (281080053345).

Almost surely, 2^{1123456678889} is an apocalyptic number.

It is an amenable number.

1123456678889 is a deficient number, since it is larger than the sum of its proper divisors (863534491).

1123456678889 is an equidigital number, since it uses as much as digits as its factorization.

1123456678889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863534490.

The product of its digits is 139345920, while the sum is 68.

The spelling of 1123456678889 in words is "one trillion, one hundred twenty-three billion, four hundred fifty-six million, six hundred seventy-eight thousand, eight hundred eighty-nine".