111917 has 4 divisors (see below), whose sum is σ = 120540. Its totient is φ = 103296.

The previous prime is 111913. The next prime is 111919. The reversal of 111917 is 719111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 719111 = 67 ⋅10733.

It can be written as a sum of positive squares in 2 ways, for example, as 21316 + 90601 = 146^2 + 301^2 .

It is a cyclic number.

It is not a de Polignac number, because 111917 - 2² = 111913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111913) 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, 4292 + ... + 4317.

It is an arithmetic number, because the mean of its divisors is an integer number (30135).

2¹¹¹⁹¹⁷ is an apocalyptic number.

It is an amenable number.

111917 is a deficient number, since it is larger than the sum of its proper divisors (8623).

111917 is an equidigital number, since it uses as much as digits as its factorization.

111917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8622.

The product of its digits is 63, while the sum is 20.

The square root of 111917 is about 334.5399826628. The cubic root of 111917 is about 48.1909350904.

The spelling of 111917 in words is "one hundred eleven thousand, nine hundred seventeen".