9861649 has 16 divisors (see below), whose sum is σ = 12096000. Its totient is φ = 7847424.

The previous prime is 9861637. The next prime is 9861661. The reversal of 9861649 is 9461689.

It is an interprime number because it is at equal distance from previous prime (9861637) and next prime (9861661).

It is a cyclic number.

It is not a de Polignac number, because 9861649 - 2¹¹ = 9859601 is a prime.

Its product of digits (93312) is a multiple of the sum of its prime divisors (1152).

It is not an unprimeable number, because it can be changed into a prime (9861619) 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 in 15 ways as a sum of consecutive naturals, for example, 8877 + ... + 9925.

It is an arithmetic number, because the mean of its divisors is an integer number (756000).

Almost surely, 2^9861649 is an apocalyptic number.

It is an amenable number.

9861649 is a deficient number, since it is larger than the sum of its proper divisors (2234351).

9861649 is a wasteful number, since it uses less digits than its factorization.

9861649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152.

The product of its digits is 93312, while the sum is 43.

The square root of 9861649 is about 3140.3262569357. The cubic root of 9861649 is about 214.4452908074.

The spelling of 9861649 in words is "nine million, eight hundred sixty-one thousand, six hundred forty-nine".