111311521 has 2 divisors, whose sum is σ = 111311522. Its totient is φ = 111311520.

The previous prime is 111311507. The next prime is 111311531. The reversal of 111311521 is 125113111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103245921 + 8065600 = 10161^2 + 2840^2 .

It is an emirp because it is prime and its reverse (125113111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111311521 - 2⁵ = 111311489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111311495 and 111311504.

It is not a weakly prime, because it can be changed into another prime (111311531) 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, 55655760 + 55655761.

It is an arithmetic number, because the mean of its divisors is an integer number (55655761).

Almost surely, 2^111311521 is an apocalyptic number.

It is an amenable number.

111311521 is a deficient number, since it is larger than the sum of its proper divisors (1).

111311521 is an equidigital number, since it uses as much as digits as its factorization.

111311521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30, while the sum is 16.

The square root of 111311521 is about 10550.4275268825. The cubic root of 111311521 is about 481.0387242391.

Adding to 111311521 its reverse (125113111), we get a palindrome (236424632).

The spelling of 111311521 in words is "one hundred eleven million, three hundred eleven thousand, five hundred twenty-one".