11481521 has 2 divisors, whose sum is σ = 11481522. Its totient is φ = 11481520.

The previous prime is 11481497. The next prime is 11481523. The reversal of 11481521 is 12518411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 57121 = 3380^2 + 239^2 .

It is an emirp because it is prime and its reverse (12518411) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11481521 is a prime.

Together with 11481523, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (11481523) 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, 5740760 + 5740761.

It is an arithmetic number, because the mean of its divisors is an integer number (5740761).

Almost surely, 2^11481521 is an apocalyptic number.

It is an amenable number.

11481521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11481521 is an equidigital number, since it uses as much as digits as its factorization.

11481521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 23.

The square root of 11481521 is about 3388.4393162635. The cubic root of 11481521 is about 225.5969072330.

Adding to 11481521 its reverse (12518411), we get a palindrome (23999932).

The spelling of 11481521 in words is "eleven million, four hundred eighty-one thousand, five hundred twenty-one".