2191836671 has 8 divisors (see below), whose sum is σ = 2246454000. Its totient is φ = 2137274560.

The previous prime is 2191836659. The next prime is 2191836701. The reversal of 2191836671 is 1766381912.

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 2191836671 - 2²² = 2187642367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191836641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73325 + ... + 98793.

It is an arithmetic number, because the mean of its divisors is an integer number (280806750).

Almost surely, 2^2191836671 is an apocalyptic number.

2191836671 is a deficient number, since it is larger than the sum of its proper divisors (54617329).

2191836671 is a wasteful number, since it uses less digits than its factorization.

2191836671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27609.

The product of its digits is 108864, while the sum is 44.

The square root of 2191836671 is about 46817.0553431119. The cubic root of 2191836671 is about 1298.9807930584.

The spelling of 2191836671 in words is "two billion, one hundred ninety-one million, eight hundred thirty-six thousand, six hundred seventy-one".