111979943 has 4 divisors (see below), whose sum is σ = 112041480. Its totient is φ = 111918408.

The previous prime is 111979921. The next prime is 111979963. The reversal of 111979943 is 349979111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 349979111 = 199 ⋅1758689.

It is a cyclic number.

It is not a de Polignac number, because 111979943 - 2⁸ = 111979687 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111979894 and 111979903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111979963) 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, 27953 + ... + 31706.

It is an arithmetic number, because the mean of its divisors is an integer number (28010370).

Almost surely, 2^111979943 is an apocalyptic number.

111979943 is a deficient number, since it is larger than the sum of its proper divisors (61537).

111979943 is an equidigital number, since it uses as much as digits as its factorization.

111979943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61536.

The product of its digits is 61236, while the sum is 44.

The square root of 111979943 is about 10582.0575976508. The cubic root of 111979943 is about 481.9996771748. Note that the first 3 decimals are identical.

The spelling of 111979943 in words is "one hundred eleven million, nine hundred seventy-nine thousand, nine hundred forty-three".