11515313 has 4 divisors (see below), whose sum is σ = 11629428. Its totient is φ = 11401200.

The previous prime is 11515303. The next prime is 11515321. The reversal of 11515313 is 31351511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5793649 + 5721664 = 2407^2 + 2392^2 .

It is a cyclic number.

It is not a de Polignac number, because 11515313 - 2⁸ = 11515057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11515303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56906 + ... + 57107.

It is an arithmetic number, because the mean of its divisors is an integer number (2907357).

Almost surely, 2^11515313 is an apocalyptic number.

It is an amenable number.

11515313 is a deficient number, since it is larger than the sum of its proper divisors (114115).

11515313 is a wasteful number, since it uses less digits than its factorization.

11515313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114114.

The product of its digits is 225, while the sum is 20.

The square root of 11515313 is about 3393.4220191423. The cubic root of 11515313 is about 225.8180133608.

Adding to 11515313 its reverse (31351511), we get a palindrome (42866824).

The spelling of 11515313 in words is "eleven million, five hundred fifteen thousand, three hundred thirteen".