111123156523 has 2 divisors, whose sum is σ = 111123156524. Its totient is φ = 111123156522.

The previous prime is 111123156497. The next prime is 111123156527. The reversal of 111123156523 is 325651321111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111123156523 is a prime.

It is not a weakly prime, because it can be changed into another prime (111123156527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55561578261 + 55561578262.

It is an arithmetic number, because the mean of its divisors is an integer number (55561578262).

Almost surely, 2^111123156523 is an apocalyptic number.

111123156523 is a deficient number, since it is larger than the sum of its proper divisors (1).

111123156523 is an equidigital number, since it uses as much as digits as its factorization.

111123156523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 31.

Adding to 111123156523 its reverse (325651321111), we get a palindrome (436774477634).

The spelling of 111123156523 in words is "one hundred eleven billion, one hundred twenty-three million, one hundred fifty-six thousand, five hundred twenty-three".