1123445689 has 4 divisors (see below), whose sum is σ = 1153809124. Its totient is φ = 1093082256.

The previous prime is 1123445681. The next prime is 1123445767. The reversal of 1123445689 is 9865443211.

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 954315664 + 169130025 = 30892^2 + 13005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123445689 - 2³ = 1123445681 is a prime.

It is a super-2 number, since 2×1123445689² = 2524260432265369442, which contains 22 as substring.

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 (1123445681) 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, 15181662 + ... + 15181735.

It is an arithmetic number, because the mean of its divisors is an integer number (288452281).

Almost surely, 2^1123445689 is an apocalyptic number.

It is an amenable number.

1123445689 is a deficient number, since it is larger than the sum of its proper divisors (30363435).

1123445689 is an equidigital number, since it uses as much as digits as its factorization.

1123445689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30363434.

The product of its digits is 207360, while the sum is 43.

The square root of 1123445689 is about 33517.8413535239. The cubic root of 1123445689 is about 1039.5627134118.

The spelling of 1123445689 in words is "one billion, one hundred twenty-three million, four hundred forty-five thousand, six hundred eighty-nine".