111979 has 8 divisors (see below), whose sum is σ = 135648. Its totient is φ = 90240.

The previous prime is 111977. The next prime is 111997. The reversal of 111979 is 979111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111979 - 2¹ = 111977 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (111973) 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 in 7 ways as a sum of consecutive naturals, for example, 352 + ... + 589.

It is an arithmetic number, because the mean of its divisors is an integer number (16956).

2¹¹¹⁹⁷⁹ is an apocalyptic number.

111979 is a deficient number, since it is larger than the sum of its proper divisors (23669).

111979 is an equidigital number, since it uses as much as digits as its factorization.

111979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965.

The product of its digits is 567, while the sum is 28.

The square root of 111979 is about 334.6326343918. The cubic root of 111979 is about 48.1998324174.

The spelling of 111979 in words is "one hundred eleven thousand, nine hundred seventy-nine".