11515481 has 2 divisors, whose sum is σ = 11515482. Its totient is φ = 11515480.

The previous prime is 11515459. The next prime is 11515489. The reversal of 11515481 is 18451511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9665881 + 1849600 = 3109^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 11515481 - 2⁶ = 11515417 is a prime.

It is a super-2 number, since 2×11515481² = 265212605322722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11515481.

It is not a weakly prime, because it can be changed into another prime (11515489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5757740 + 5757741.

It is an arithmetic number, because the mean of its divisors is an integer number (5757741).

Almost surely, 2^11515481 is an apocalyptic number.

It is an amenable number.

11515481 is a deficient number, since it is larger than the sum of its proper divisors (1).

11515481 is an equidigital number, since it uses as much as digits as its factorization.

11515481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 800, while the sum is 26.

The square root of 11515481 is about 3393.4467728255. The cubic root of 11515481 is about 225.8191115287.

Adding to 11515481 its reverse (18451511), we get a palindrome (29966992).

The spelling of 11515481 in words is "eleven million, five hundred fifteen thousand, four hundred eighty-one".