111561113 has 4 divisors (see below), whose sum is σ = 111612468. Its totient is φ = 111509760.

The previous prime is 111561101. The next prime is 111561119. The reversal of 111561113 is 311165111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 311165111 = 17573 ⋅17707.

It can be written as a sum of positive squares in 2 ways, for example, as 80335369 + 31225744 = 8963^2 + 5588^2 .

It is a cyclic number.

It is not a de Polignac number, because 111561113 - 2⁸ = 111560857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111561119) 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, 22268 + ... + 26813.

It is an arithmetic number, because the mean of its divisors is an integer number (27903117).

Almost surely, 2^111561113 is an apocalyptic number.

It is an amenable number.

111561113 is a deficient number, since it is larger than the sum of its proper divisors (51355).

111561113 is an equidigital number, since it uses as much as digits as its factorization.

111561113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51354.

The product of its digits is 90, while the sum is 20.

The square root of 111561113 is about 10562.2494289806. The cubic root of 111561113 is about 481.3979975921.

The spelling of 111561113 in words is "one hundred eleven million, five hundred sixty-one thousand, one hundred thirteen".