2191049856 has 96 divisors (see below), whose sum is σ = 6315366720. Its totient is φ = 729146880.

The previous prime is 2191049843. The next prime is 2191049867. The reversal of 2191049856 is 6589401912.

2191049856 is a `hidden beast` number, since 21 + 91 + 0 + 498 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 946941 + ... + 949251.

It is an arithmetic number, because the mean of its divisors is an integer number (65785070).

Almost surely, 2^2191049856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191049856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3157683360).

2191049856 is an abundant number, since it is smaller than the sum of its proper divisors (4124316864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191049856 is a wasteful number, since it uses less digits than its factorization.

2191049856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3154 (or 3139 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 2191049856 is about 46808.6515080279. The cubic root of 2191049856 is about 1298.8253404938.

The spelling of 2191049856 in words is "two billion, one hundred ninety-one million, forty-nine thousand, eight hundred fifty-six".