11817859 has 2 divisors, whose sum is σ = 11817860. Its totient is φ = 11817858.

The previous prime is 11817853. The next prime is 11817863. The reversal of 11817859 is 95871811.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11817859 is a prime.

It is not a weakly prime, because it can be changed into another prime (11817853) 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, 5908929 + 5908930.

It is an arithmetic number, because the mean of its divisors is an integer number (5908930).

Almost surely, 2^11817859 is an apocalyptic number.

11817859 is a deficient number, since it is larger than the sum of its proper divisors (1).

11817859 is an equidigital number, since it uses as much as digits as its factorization.

11817859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 40.

The square root of 11817859 is about 3437.7113025965. The cubic root of 11817859 is about 227.7786080654.

The spelling of 11817859 in words is "eleven million, eight hundred seventeen thousand, eight hundred fifty-nine".