9855849091 has 16 divisors (see below), whose sum is σ = 10799538048. Its totient is φ = 8920195200.

The previous prime is 9855849077. The next prime is 9855849121. The reversal of 9855849091 is 1909485589.

It is a cyclic number.

It is not a de Polignac number, because 9855849091 - 2¹⁹ = 9855324803 is a prime.

It is a super-2 number, since 2×9855849091² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9855849041) 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, 3271776 + ... + 3274786.

It is an arithmetic number, because the mean of its divisors is an integer number (674971128).

Almost surely, 2^9855849091 is an apocalyptic number.

9855849091 is a deficient number, since it is larger than the sum of its proper divisors (943688957).

9855849091 is a wasteful number, since it uses less digits than its factorization.

9855849091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4242.

The product of its (nonzero) digits is 4665600, while the sum is 58.

The square root of 9855849091 is about 99276.6291279070. The cubic root of 9855849091 is about 2144.0324215733.

The spelling of 9855849091 in words is "nine billion, eight hundred fifty-five million, eight hundred forty-nine thousand, ninety-one".