111306521 has 2 divisors, whose sum is σ = 111306522. Its totient is φ = 111306520.

The previous prime is 111306511. The next prime is 111306527. The reversal of 111306521 is 125603111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57078025 + 54228496 = 7555^2 + 7364^2 .

It is an emirp because it is prime and its reverse (125603111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111306521 - 2⁶ = 111306457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111306493 and 111306502.

It is not a weakly prime, because it can be changed into another prime (111306527) 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 as a sum of consecutive naturals, namely, 55653260 + 55653261.

It is an arithmetic number, because the mean of its divisors is an integer number (55653261).

Almost surely, 2^111306521 is an apocalyptic number.

It is an amenable number.

111306521 is a deficient number, since it is larger than the sum of its proper divisors (1).

111306521 is an equidigital number, since it uses as much as digits as its factorization.

111306521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 111306521 is about 10550.1905669993. The cubic root of 111306521 is about 481.0315215416.

Adding to 111306521 its reverse (125603111), we get a palindrome (236909632).

The spelling of 111306521 in words is "one hundred eleven million, three hundred six thousand, five hundred twenty-one".