11809859 has 2 divisors, whose sum is σ = 11809860. Its totient is φ = 11809858.

The previous prime is 11809841. The next prime is 11809871. The reversal of 11809859 is 95890811.

It is a strong prime.

It is an emirp because it is prime and its reverse (95890811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11809859 - 2¹² = 11805763 is a prime.

It is not a weakly prime, because it can be changed into another prime (11809159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5904929 + 5904930.

It is an arithmetic number, because the mean of its divisors is an integer number (5904930).

Almost surely, 2^11809859 is an apocalyptic number.

11809859 is a deficient number, since it is larger than the sum of its proper divisors (1).

11809859 is an equidigital number, since it uses as much as digits as its factorization.

11809859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 11809859 is about 3436.5475407740. The cubic root of 11809859 is about 227.7271988606.

The spelling of 11809859 in words is "eleven million, eight hundred nine thousand, eight hundred fifty-nine".