11515321 has 2 divisors, whose sum is σ = 11515322. Its totient is φ = 11515320.

The previous prime is 11515303. The next prime is 11515333. The reversal of 11515321 is 12351511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10169721 + 1345600 = 3189^2 + 1160^2 .

It is an emirp because it is prime and its reverse (12351511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11515321 - 2⁵ = 11515289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11515391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5757660 + 5757661.

It is an arithmetic number, because the mean of its divisors is an integer number (5757661).

Almost surely, 2^11515321 is an apocalyptic number.

It is an amenable number.

11515321 is a deficient number, since it is larger than the sum of its proper divisors (1).

11515321 is an equidigital number, since it uses as much as digits as its factorization.

11515321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 19.

The square root of 11515321 is about 3393.4231978932. The cubic root of 11515321 is about 225.8180656548.

Adding to 11515321 its reverse (12351511), we get a palindrome (23866832).

The spelling of 11515321 in words is "eleven million, five hundred fifteen thousand, three hundred twenty-one".