11118521 has 2 divisors, whose sum is σ = 11118522. Its totient is φ = 11118520.

The previous prime is 11118517. The next prime is 11118533. The reversal of 11118521 is 12581111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6431296 + 4687225 = 2536^2 + 2165^2 .

It is an emirp because it is prime and its reverse (12581111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11118521 - 2² = 11118517 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11118493 and 11118502.

It is not a weakly prime, because it can be changed into another prime (11118511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5559260 + 5559261.

It is an arithmetic number, because the mean of its divisors is an integer number (5559261).

Almost surely, 2^11118521 is an apocalyptic number.

It is an amenable number.

11118521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11118521 is an equidigital number, since it uses as much as digits as its factorization.

11118521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80, while the sum is 20.

The square root of 11118521 is about 3334.4446314192. Note that the first 3 decimals coincide. The cubic root of 11118521 is about 223.1939099091.

Adding to 11118521 its reverse (12581111), we get a palindrome (23699632).

The spelling of 11118521 in words is "eleven million, one hundred eighteen thousand, five hundred twenty-one".