111117121 has 4 divisors (see below), whose sum is σ = 112196032. Its totient is φ = 110038212.

The previous prime is 111117101. The next prime is 111117131. The reversal of 111117121 is 121711111.

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 an emirpimes, since its reverse is a distinct semiprime: 121711111 = 71 ⋅1714241.

It is a cyclic number.

It is not a de Polignac number, because 111117121 - 2¹⁵ = 111084353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111117095 and 111117104.

It is not an unprimeable number, because it can be changed into a prime (111117101) 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, 539301 + ... + 539506.

It is an arithmetic number, because the mean of its divisors is an integer number (28049008).

Almost surely, 2^111117121 is an apocalyptic number.

It is an amenable number.

111117121 is a deficient number, since it is larger than the sum of its proper divisors (1078911).

111117121 is a wasteful number, since it uses less digits than its factorization.

111117121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078910.

The product of its digits is 14, while the sum is 16.

The square root of 111117121 is about 10541.2106041005. The cubic root of 111117121 is about 480.7585243725.

Adding to 111117121 its reverse (121711111), we get a palindrome (232828232).

The spelling of 111117121 in words is "one hundred eleven million, one hundred seventeen thousand, one hundred twenty-one".