1123445681 has 2 divisors, whose sum is σ = 1123445682. Its totient is φ = 1123445680.

The previous prime is 1123445627. The next prime is 1123445767. The reversal of 1123445681 is 1865443211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 883040656 + 240405025 = 29716^2 + 15505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123445681 - 2²² = 1119251377 is a prime.

It is a super-3 number, since 3×1123445681³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1123445881) 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, 561722840 + 561722841.

It is an arithmetic number, because the mean of its divisors is an integer number (561722841).

Almost surely, 2^1123445681 is an apocalyptic number.

It is an amenable number.

1123445681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123445681 is an equidigital number, since it uses as much as digits as its factorization.

1123445681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 35.

The square root of 1123445681 is about 33517.8412341845. The cubic root of 1123445681 is about 1039.5627109442.

Adding to 1123445681 its reverse (1865443211), we get a palindrome (2988888892).

The spelling of 1123445681 in words is "one billion, one hundred twenty-three million, four hundred forty-five thousand, six hundred eighty-one".