1111123345681 has 4 divisors (see below), whose sum is σ = 1111129615332. Its totient is φ = 1111117076032.

The previous prime is 1111123345679. The next prime is 1111123345699. The reversal of 1111123345681 is 1865433211111.

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 984500528400 + 126622817281 = 992220^2 + 355841^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111123345681 - 2¹ = 1111123345679 is a prime.

It is a super-2 number, since 2×1111123345681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111123345681.

It is not an unprimeable number, because it can be changed into a prime (1111123340681) 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, 2861020 + ... + 3226093.

It is an arithmetic number, because the mean of its divisors is an integer number (277782403833).

Almost surely, 2^{1111123345681} is an apocalyptic number.

It is an amenable number.

1111123345681 is a deficient number, since it is larger than the sum of its proper divisors (6269651).

1111123345681 is an equidigital number, since it uses as much as digits as its factorization.

1111123345681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6269650.

The product of its digits is 17280, while the sum is 37.

Adding to 1111123345681 its reverse (1865433211111), we get a palindrome (2976556556792).

The spelling of 1111123345681 in words is "one trillion, one hundred eleven billion, one hundred twenty-three million, three hundred forty-five thousand, six hundred eighty-one".