9856081091 has 16 divisors (see below), whose sum is σ = 10142668800. Its totient is φ = 9572918688.

The previous prime is 9856081031. The next prime is 9856081097. The reversal of 9856081091 is 1901806589.

It is a cyclic number.

It is not a de Polignac number, because 9856081091 - 2¹⁴ = 9856064707 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9856081097) 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, 7471730 + ... + 7473048.

It is an arithmetic number, because the mean of its divisors is an integer number (633916800).

Almost surely, 2^9856081091 is an apocalyptic number.

9856081091 is a deficient number, since it is larger than the sum of its proper divisors (286587709).

9856081091 is a wasteful number, since it uses less digits than its factorization.

9856081091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458.

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 9856081091 is about 99277.7975732742. The cubic root of 9856081091 is about 2144.0492444641.

The spelling of 9856081091 in words is "nine billion, eight hundred fifty-six million, eighty-one thousand, ninety-one".