2191841138 has 16 divisors (see below), whose sum is σ = 3305115360. Its totient is φ = 1090152000.

The previous prime is 2191841137. The next prime is 2191841147. The reversal of 2191841138 is 8311481912.

It is not an unprimeable number, because it can be changed into a prime (2191841131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300353 + ... + 307563.

It is an arithmetic number, because the mean of its divisors is an integer number (206569710).

Almost surely, 2^2191841138 is an apocalyptic number.

2191841138 is a deficient number, since it is larger than the sum of its proper divisors (1113274222).

2191841138 is a wasteful number, since it uses less digits than its factorization.

2191841138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7993.

The product of its digits is 13824, while the sum is 38.

The square root of 2191841138 is about 46817.1030500607. The cubic root of 2191841138 is about 1298.9816755060.

The spelling of 2191841138 in words is "two billion, one hundred ninety-one million, eight hundred forty-one thousand, one hundred thirty-eight".