9661859 has 2 divisors, whose sum is σ = 9661860. Its totient is φ = 9661858.

The previous prime is 9661853. The next prime is 9661867. The reversal of 9661859 is 9581669.

It is a weak prime.

It is an emirp because it is prime and its reverse (9581669) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9661859 - 2¹² = 9657763 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (9661853) 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, 4830929 + 4830930.

It is an arithmetic number, because the mean of its divisors is an integer number (4830930).

Almost surely, 2^9661859 is an apocalyptic number.

9661859 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661859 is an equidigital number, since it uses as much as digits as its factorization.

9661859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 44.

The square root of 9661859 is about 3108.3531009202. The cubic root of 9661859 is about 212.9872298691.

The spelling of 9661859 in words is "nine million, six hundred sixty-one thousand, eight hundred fifty-nine".