111110161 has 4 divisors (see below), whose sum is σ = 112632292. Its totient is φ = 109588032.

The previous prime is 111110143. The next prime is 111110177. The reversal of 111110161 is 161011111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49000000 + 62110161 = 7000^2 + 7881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111110161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111117161) 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, 760956 + ... + 761101.

It is an arithmetic number, because the mean of its divisors is an integer number (28158073).

Almost surely, 2^111110161 is an apocalyptic number.

It is an amenable number.

111110161 is a deficient number, since it is larger than the sum of its proper divisors (1522131).

111110161 is an equidigital number, since it uses as much as digits as its factorization.

111110161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522130.

The product of its (nonzero) digits is 6, while the sum is 13.

The square root of 111110161 is about 10540.8804660711. The cubic root of 111110161 is about 480.7484864679.

Adding to 111110161 its reverse (161011111), we get a palindrome (272121272).

The spelling of 111110161 in words is "one hundred eleven million, one hundred ten thousand, one hundred sixty-one".