111616161 has 8 divisors (see below), whose sum is σ = 152843904. Its totient is φ = 72399600.

The previous prime is 111616123. The next prime is 111616163. The reversal of 111616161 is 161616111.

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

It is not a de Polignac number, because 111616161 - 2¹⁰ = 111615137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111616163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502665 + ... + 502886.

It is an arithmetic number, because the mean of its divisors is an integer number (19105488).

Almost surely, 2^111616161 is an apocalyptic number.

It is an amenable number.

111616161 is a deficient number, since it is larger than the sum of its proper divisors (41227743).

111616161 is a wasteful number, since it uses less digits than its factorization.

111616161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005591.

The product of its digits is 216, while the sum is 24.

The square root of 111616161 is about 10564.8549919059. The cubic root of 111616161 is about 481.4771638858.

It can be divided in two parts, 11 and 1616161, that multiplied together give a palindrome (17777771).

The spelling of 111616161 in words is "one hundred eleven million, six hundred sixteen thousand, one hundred sixty-one".