2191897199 has 2 divisors, whose sum is σ = 2191897200. Its totient is φ = 2191897198.

The previous prime is 2191897181. The next prime is 2191897223. The reversal of 2191897199 is 9917981912.

2191897199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2191897199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2191897139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095948599 + 1095948600.

It is an arithmetic number, because the mean of its divisors is an integer number (1095948600).

Almost surely, 2^2191897199 is an apocalyptic number.

2191897199 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191897199 is an equidigital number, since it uses as much as digits as its factorization.

2191897199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 56.

The square root of 2191897199 is about 46817.7017697366. The cubic root of 2191897199 is about 1298.9927501515.

The spelling of 2191897199 in words is "two billion, one hundred ninety-one million, eight hundred ninety-seven thousand, one hundred ninety-nine".