111539 has 2 divisors, whose sum is σ = 111540. Its totient is φ = 111538.

The previous prime is 111533. The next prime is 111577. The reversal of 111539 is 935111.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111539 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111539.

It is not a weakly prime, because it can be changed into another prime (111533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55769 + 55770.

It is an arithmetic number, because the mean of its divisors is an integer number (55770).

2¹¹¹⁵³⁹ is an apocalyptic number.

111539 is a deficient number, since it is larger than the sum of its proper divisors (1).

111539 is an equidigital number, since it uses as much as digits as its factorization.

111539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 135, while the sum is 20.

The square root of 111539 is about 333.9745499286. The cubic root of 111539 is about 48.1366188846.

The spelling of 111539 in words is "one hundred eleven thousand, five hundred thirty-nine".