9661855 has 16 divisors (see below), whose sum is σ = 13575744. Its totient is φ = 6462720.

The previous prime is 9661853. The next prime is 9661859. The reversal of 9661855 is 5581669.

It is not a de Polignac number, because 9661855 - 2¹ = 9661853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9661853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1932 + ... + 4801.

It is an arithmetic number, because the mean of its divisors is an integer number (848484).

Almost surely, 2^9661855 is an apocalyptic number.

9661855 is a deficient number, since it is larger than the sum of its proper divisors (3913889).

9661855 is a wasteful number, since it uses less digits than its factorization.

9661855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6786.

The product of its digits is 64800, while the sum is 40.

The square root of 9661855 is about 3108.3524574926. The cubic root of 9661855 is about 212.9872004769.

The spelling of 9661855 in words is "nine million, six hundred sixty-one thousand, eight hundred fifty-five".