111611121 has 8 divisors (see below), whose sum is σ = 150698880. Its totient is φ = 73465392.

The previous prime is 111611113. The next prime is 111611131. The reversal of 111611121 is 121116111.

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

It is not a de Polignac number, because 111611121 - 2³ = 111611113 is a prime.

It is a super-3 number, since 3×111611121³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111611121.

It is not an unprimeable number, because it can be changed into a prime (111611131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235230 + ... + 235703.

It is an arithmetic number, because the mean of its divisors is an integer number (18837360).

Almost surely, 2^111611121 is an apocalyptic number.

It is an amenable number.

111611121 is a deficient number, since it is larger than the sum of its proper divisors (39087759).

111611121 is an equidigital number, since it uses as much as digits as its factorization.

111611121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471015.

The product of its digits is 12, while the sum is 15.

The square root of 111611121 is about 10564.6164625130. The cubic root of 111611121 is about 481.4699167829.

Adding to 111611121 its reverse (121116111), we get a palindrome (232727232).

The spelling of 111611121 in words is "one hundred eleven million, six hundred eleven thousand, one hundred twenty-one".