111144521 has 8 divisors (see below), whose sum is σ = 118022184. Its totient is φ = 104304640.

The previous prime is 111144511. The next prime is 111144577. The reversal of 111144521 is 125441111.

It can be written as a sum of positive squares in 4 ways, for example, as 62647225 + 48497296 = 7915^2 + 6964^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 111144521 - 2⁶ = 111144457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111144493 and 111144502.

It is not an unprimeable number, because it can be changed into a prime (111144511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3260 + ... + 15261.

It is an arithmetic number, because the mean of its divisors is an integer number (14752773).

Almost surely, 2^111144521 is an apocalyptic number.

It is an amenable number.

111144521 is a deficient number, since it is larger than the sum of its proper divisors (6877663).

111144521 is a wasteful number, since it uses less digits than its factorization.

111144521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18891.

The product of its digits is 160, while the sum is 20.

The square root of 111144521 is about 10542.5101849607. The cubic root of 111144521 is about 480.7980373382.

Adding to 111144521 its reverse (125441111), we get a palindrome (236585632).

The spelling of 111144521 in words is "one hundred eleven million, one hundred forty-four thousand, five hundred twenty-one".