111000521 has 2 divisors, whose sum is σ = 111000522. Its totient is φ = 111000520.

The previous prime is 111000499. The next prime is 111000569. The reversal of 111000521 is 125000111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81721600 + 29278921 = 9040^2 + 5411^2 .

It is a cyclic number.

It is not a de Polignac number, because 111000521 - 2⁶ = 111000457 is a prime.

It is a super-2 number, since 2×111000521² = 24642231324542882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111000821) 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 as a sum of consecutive naturals, namely, 55500260 + 55500261.

It is an arithmetic number, because the mean of its divisors is an integer number (55500261).

Almost surely, 2^111000521 is an apocalyptic number.

It is an amenable number.

111000521 is a deficient number, since it is larger than the sum of its proper divisors (1).

111000521 is an equidigital number, since it uses as much as digits as its factorization.

111000521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10, while the sum is 11.

The square root of 111000521 is about 10535.6784783895. The cubic root of 111000521 is about 480.5903052827.

Adding to 111000521 its reverse (125000111), we get a palindrome (236000632).

The spelling of 111000521 in words is "one hundred eleven million, five hundred twenty-one", and thus it is an aban number.