2191899047 has 8 divisors (see below), whose sum is σ = 2362996944. Its totient is φ = 2021156928.

The previous prime is 2191899043. The next prime is 2191899049. The reversal of 2191899047 is 7409981912.

2191899047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2191899047 - 2² = 2191899043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2191898986 and 2191899004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191899043) 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, 76073 + ... + 100850.

It is an arithmetic number, because the mean of its divisors is an integer number (295374618).

Almost surely, 2^2191899047 is an apocalyptic number.

2191899047 is a deficient number, since it is larger than the sum of its proper divisors (171097897).

2191899047 is a wasteful number, since it uses less digits than its factorization.

2191899047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177889.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 2191899047 is about 46817.7215058572. The cubic root of 2191899047 is about 1298.9931152139.

The spelling of 2191899047 in words is "two billion, one hundred ninety-one million, eight hundred ninety-nine thousand, forty-seven".