11515261 has 4 divisors (see below), whose sum is σ = 11599452. Its totient is φ = 11431072.

The previous prime is 11515253. The next prime is 11515279. The reversal of 11515261 is 16251511.

It is a happy number.

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 5784025 + 5731236 = 2405^2 + 2394^2 .

It is a cyclic number.

It is not a de Polignac number, because 11515261 - 2³ = 11515253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11515201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41890 + ... + 42163.

It is an arithmetic number, because the mean of its divisors is an integer number (2899863).

Almost surely, 2^11515261 is an apocalyptic number.

It is an amenable number.

11515261 is a deficient number, since it is larger than the sum of its proper divisors (84191).

11515261 is an equidigital number, since it uses as much as digits as its factorization.

11515261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84190.

The product of its digits is 300, while the sum is 22.

The square root of 11515261 is about 3393.4143572514. The cubic root of 11515261 is about 225.8176734495.

Adding to 11515261 its reverse (16251511), we get a palindrome (27766772).

It can be divided in two parts, 115 and 15261, that added together give a square (15376 = 124²).

The spelling of 11515261 in words is "eleven million, five hundred fifteen thousand, two hundred sixty-one".