111523 has 4 divisors (see below), whose sum is σ = 112240. Its totient is φ = 110808.

The previous prime is 111521. The next prime is 111533. The reversal of 111523 is 325111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 325111 = 83 ⋅3917.

It is a cyclic number.

It is not a de Polignac number, because 111523 - 2¹ = 111521 is a prime.

It is a Duffinian number.

111523 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (111521) 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, 15 + ... + 472.

It is an arithmetic number, because the mean of its divisors is an integer number (28060).

2¹¹¹⁵²³ is an apocalyptic number.

111523 is a deficient number, since it is larger than the sum of its proper divisors (717).

111523 is an equidigital number, since it uses as much as digits as its factorization.

111523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716.

The product of its digits is 30, while the sum is 13.

The square root of 111523 is about 333.9505951484. The cubic root of 111523 is about 48.1343170807.

Adding to 111523 its reverse (325111), we get a palindrome (436634).

The spelling of 111523 in words is "one hundred eleven thousand, five hundred twenty-three".