11315521 has 6 divisors (see below), whose sum is σ = 13163010. Its totient is φ = 9698976.

The previous prime is 11315519. The next prime is 11315533. The reversal of 11315521 is 12551311.

It can be written as a sum of positive squares in only one way, i.e., 11289600 + 25921 = 3360^2 + 161^2 .

It is not a de Polignac number, because 11315521 - 2¹ = 11315519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11315501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115416 + ... + 115513.

It is an arithmetic number, because the mean of its divisors is an integer number (2193835).

Almost surely, 2^11315521 is an apocalyptic number.

It is an amenable number.

11315521 is a deficient number, since it is larger than the sum of its proper divisors (1847489).

11315521 is an equidigital number, since it uses as much as digits as its factorization.

11315521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230943 (or 230936 counting only the distinct ones).

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

The square root of 11315521 is about 3363.8550801127. The cubic root of 11315521 is about 224.5043972135.

Adding to 11315521 its reverse (12551311), we get a palindrome (23866832).

The spelling of 11315521 in words is "eleven million, three hundred fifteen thousand, five hundred twenty-one".