11871689 has 2 divisors, whose sum is σ = 11871690. Its totient is φ = 11871688.

The previous prime is 11871659. The next prime is 11871707. The reversal of 11871689 is 98617811.

11871689 is digitally balanced in base 2, 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., 11505664 + 366025 = 3392^2 + 605^2 .

It is an emirp because it is prime and its reverse (98617811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11871689 is a prime.

It is not a weakly prime, because it can be changed into another prime (11871619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5935844 + 5935845.

It is an arithmetic number, because the mean of its divisors is an integer number (5935845).

Almost surely, 2^11871689 is an apocalyptic number.

It is an amenable number.

11871689 is a deficient number, since it is larger than the sum of its proper divisors (1).

11871689 is an equidigital number, since it uses as much as digits as its factorization.

11871689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 41.

The square root of 11871689 is about 3445.5317441579. The cubic root of 11871689 is about 228.1239259097.

The spelling of 11871689 in words is "eleven million, eight hundred seventy-one thousand, six hundred eighty-nine".