2191707071 has 4 divisors (see below), whose sum is σ = 2204376072. Its totient is φ = 2179038072.

The previous prime is 2191707059. The next prime is 2191707079. The reversal of 2191707071 is 1707071912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2191707071 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 (2191707079) 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 3 ways as a sum of consecutive naturals, for example, 6334241 + ... + 6334586.

It is an arithmetic number, because the mean of its divisors is an integer number (551094018).

Almost surely, 2^2191707071 is an apocalyptic number.

2191707071 is a deficient number, since it is larger than the sum of its proper divisors (12669001).

2191707071 is a wasteful number, since it uses less digits than its factorization.

2191707071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12669000.

The product of its (nonzero) digits is 6174, while the sum is 35.

The square root of 2191707071 is about 46815.6712116787. The cubic root of 2191707071 is about 1298.9551902947.

Adding to 2191707071 its reverse (1707071912), we get a palindrome (3898778983).

The spelling of 2191707071 in words is "two billion, one hundred ninety-one million, seven hundred seven thousand, seventy-one".