111613 has 4 divisors (see below), whose sum is σ = 112320. Its totient is φ = 110908.

The previous prime is 111611. The next prime is 111623. The reversal of 111613 is 316111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 316111 = 283 ⋅1117.

It is a cyclic number.

It is not a de Polignac number, because 111613 - 2¹ = 111611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111593 and 111602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6 + ... + 472.

It is an arithmetic number, because the mean of its divisors is an integer number (28080).

2¹¹¹⁶¹³ is an apocalyptic number.

It is an amenable number.

111613 is a deficient number, since it is larger than the sum of its proper divisors (707).

111613 is an equidigital number, since it uses as much as digits as its factorization.

111613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706.

The product of its digits is 18, while the sum is 13.

The square root of 111613 is about 334.0853184443. The cubic root of 111613 is about 48.1472618655.

Adding to 111613 its reverse (316111), we get a palindrome (427724).

The spelling of 111613 in words is "one hundred eleven thousand, six hundred thirteen".