111225561 has 32 divisors (see below), whose sum is σ = 156280320. Its totient is φ = 70312704.

The previous prime is 111225557. The next prime is 111225571. The reversal of 111225561 is 165522111.

It is not a de Polignac number, because 111225561 - 2² = 111225557 is a prime.

It is a super-2 number, since 2×111225561² = 24742250839529442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111225511) 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 31 ways as a sum of consecutive naturals, for example, 984241 + ... + 984353.

It is an arithmetic number, because the mean of its divisors is an integer number (4883760).

Almost surely, 2^111225561 is an apocalyptic number.

It is an amenable number.

111225561 is a deficient number, since it is larger than the sum of its proper divisors (45054759).

111225561 is a wasteful number, since it uses less digits than its factorization.

111225561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325.

The product of its digits is 600, while the sum is 24.

The square root of 111225561 is about 10546.3529715253. The cubic root of 111225561 is about 480.9148654295.

Adding to 111225561 its reverse (165522111), we get a palindrome (276747672).

The spelling of 111225561 in words is "one hundred eleven million, two hundred twenty-five thousand, five hundred sixty-one".