111568131 has 8 divisors (see below), whose sum is σ = 165286160. Its totient is φ = 74378736.

The previous prime is 111568129. The next prime is 111568159. The reversal of 111568131 is 131865111.

It is a happy number.

It is not a de Polignac number, because 111568131 - 2¹ = 111568129 is a prime.

It is a super-2 number, since 2×111568131² = 24894895709666322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4132153 = 111568131 / (1 + 1 + 1 + 5 + 6 + 8 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111568095 and 111568104.

It is not an unprimeable number, because it can be changed into a prime (111568111) 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, 2066050 + ... + 2066103.

It is an arithmetic number, because the mean of its divisors is an integer number (20660770).

Almost surely, 2^111568131 is an apocalyptic number.

111568131 is a deficient number, since it is larger than the sum of its proper divisors (53718029).

111568131 is an equidigital number, since it uses as much as digits as its factorization.

111568131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4132162 (or 4132156 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 111568131 is about 10562.5816446549. The cubic root of 111568131 is about 481.4080918511.

The spelling of 111568131 in words is "one hundred eleven million, five hundred sixty-eight thousand, one hundred thirty-one".