111123643 has 2 divisors, whose sum is σ = 111123644. Its totient is φ = 111123642.

The previous prime is 111123641. The next prime is 111123667. The reversal of 111123643 is 346321111.

It is a weak prime.

It is an emirp because it is prime and its reverse (346321111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111123643 - 2¹ = 111123641 is a prime.

Together with 111123641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (111123641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55561821 + 55561822.

It is an arithmetic number, because the mean of its divisors is an integer number (55561822).

Almost surely, 2^111123643 is an apocalyptic number.

111123643 is a deficient number, since it is larger than the sum of its proper divisors (1).

111123643 is an equidigital number, since it uses as much as digits as its factorization.

111123643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 111123643 is about 10541.5199568184. The cubic root of 111123643 is about 480.7679302010.

Adding to 111123643 its reverse (346321111), we get a palindrome (457444754).

The spelling of 111123643 in words is "one hundred eleven million, one hundred twenty-three thousand, six hundred forty-three".