111579939 has 6 divisors (see below), whose sum is σ = 161171036. Its totient is φ = 74386620.

The previous prime is 111579931. The next prime is 111579947. The reversal of 111579939 is 939975111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111579931) and next prime (111579947).

It is not a de Polignac number, because 111579939 - 2³ = 111579931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111579894 and 111579903.

It is not an unprimeable number, because it can be changed into a prime (111579931) 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 5 ways as a sum of consecutive naturals, for example, 6198877 + ... + 6198894.

Almost surely, 2^111579939 is an apocalyptic number.

111579939 is a deficient number, since it is larger than the sum of its proper divisors (49591097).

111579939 is a wasteful number, since it uses less digits than its factorization.

111579939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12397777 (or 12397774 counting only the distinct ones).

The product of its digits is 76545, while the sum is 45.

The square root of 111579939 is about 10563.1405841255. The cubic root of 111579939 is about 481.4250747959.

The spelling of 111579939 in words is "one hundred eleven million, five hundred seventy-nine thousand, nine hundred thirty-nine".