2191889896 has 64 divisors (see below), whose sum is σ = 4769251200. Its totient is φ = 924991488.

The previous prime is 2191889831. The next prime is 2191889899. The reversal of 2191889896 is 6989881912.

It is not an unprimeable number, because it can be changed into a prime (2191889899) 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, 1900456 + ... + 1901608.

It is an arithmetic number, because the mean of its divisors is an integer number (74519550).

Almost surely, 2^2191889896 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 2191889896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2384625600).

2191889896 is an abundant number, since it is smaller than the sum of its proper divisors (2577361304).

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

2191889896 is a wasteful number, since it uses less digits than its factorization.

2191889896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658 (or 1654 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 61.

The square root of 2191889896 is about 46817.6237756681. The cubic root of 2191889896 is about 1298.9913074813.

The spelling of 2191889896 in words is "two billion, one hundred ninety-one million, eight hundred eighty-nine thousand, eight hundred ninety-six".