111121656113 has 8 divisors (see below), whose sum is σ = 121927391208. Its totient is φ = 100638480384.

The previous prime is 111121656109. The next prime is 111121656133. The reversal of 111121656113 is 311656121111.

It can be written as a sum of positive squares in 4 ways, for example, as 1473254689 + 109648401424 = 38383^2 + 331132^2 .

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

It is not a de Polignac number, because 111121656113 - 2² = 111121656109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111121656103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80639120 + ... + 80640497.

It is an arithmetic number, because the mean of its divisors is an integer number (15240923901).

Almost surely, 2^111121656113 is an apocalyptic number.

111121656113 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

111121656113 is a deficient number, since it is larger than the sum of its proper divisors (10805735095).

111121656113 is a wasteful number, since it uses less digits than its factorization.

111121656113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161279683.

The product of its digits is 1080, while the sum is 29.

Adding to 111121656113 its reverse (311656121111), we get a palindrome (422777777224).

The spelling of 111121656113 in words is "one hundred eleven billion, one hundred twenty-one million, six hundred fifty-six thousand, one hundred thirteen".