11865691 has 2 divisors, whose sum is σ = 11865692. Its totient is φ = 11865690.

The previous prime is 11865683. The next prime is 11865697. The reversal of 11865691 is 19656811.

11865691 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 is a cyclic number.

It is not a de Polignac number, because 11865691 - 2³ = 11865683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11865691.

It is not a weakly prime, because it can be changed into another prime (11865697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5932845 + 5932846.

It is an arithmetic number, because the mean of its divisors is an integer number (5932846).

Almost surely, 2^11865691 is an apocalyptic number.

11865691 is a deficient number, since it is larger than the sum of its proper divisors (1).

11865691 is an equidigital number, since it uses as much as digits as its factorization.

11865691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 11865691 is about 3444.6612315292. The cubic root of 11865691 is about 228.0855006610.

It can be divided in two parts, 1186569 and 1, that added together give a triangular number (1186570 = T₁₅₄₀).

The spelling of 11865691 in words is "eleven million, eight hundred sixty-five thousand, six hundred ninety-one".