9661985 has 4 divisors (see below), whose sum is σ = 11594388. Its totient is φ = 7729584.

The previous prime is 9661979. The next prime is 9661991. The reversal of 9661985 is 5891669.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (9661979) and next prime (9661991).

It can be written as a sum of positive squares in 2 ways, for example, as 6436369 + 3225616 = 2537^2 + 1796^2 .

It is a cyclic number.

It is not a de Polignac number, because 9661985 - 2⁴ = 9661969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 966194 + ... + 966203.

It is an arithmetic number, because the mean of its divisors is an integer number (2898597).

Almost surely, 2^9661985 is an apocalyptic number.

It is an amenable number.

9661985 is a deficient number, since it is larger than the sum of its proper divisors (1932403).

9661985 is a wasteful number, since it uses less digits than its factorization.

9661985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932402.

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

The square root of 9661985 is about 3108.3733688217. The cubic root of 9661985 is about 212.9881557184.

The spelling of 9661985 in words is "nine million, six hundred sixty-one thousand, nine hundred eighty-five".