11815481 has 2 divisors, whose sum is σ = 11815482. Its totient is φ = 11815480.

The previous prime is 11815457. The next prime is 11815487. The reversal of 11815481 is 18451811.

11815481 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9517225 + 2298256 = 3085^2 + 1516^2 .

It is a cyclic number.

It is not a de Polignac number, because 11815481 - 2¹⁰ = 11814457 is a prime.

It is a super-2 number, since 2×11815481² = 279211182522722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11815487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5907740 + 5907741.

It is an arithmetic number, because the mean of its divisors is an integer number (5907741).

Almost surely, 2^11815481 is an apocalyptic number.

It is an amenable number.

11815481 is a deficient number, since it is larger than the sum of its proper divisors (1).

11815481 is an equidigital number, since it uses as much as digits as its factorization.

11815481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1280, while the sum is 29.

The square root of 11815481 is about 3437.3654155472. The cubic root of 11815481 is about 227.7633291031.

The spelling of 11815481 in words is "eleven million, eight hundred fifteen thousand, four hundred eighty-one".