6989872191 has 4 divisors (see below), whose sum is σ = 9319829592. Its totient is φ = 4659914792.

The previous prime is 6989872189. The next prime is 6989872199. The reversal of 6989872191 is 1912789896.

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

It is a cyclic number.

It is not a de Polignac number, because 6989872191 - 2¹ = 6989872189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6989872199) 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, 1164978696 + ... + 1164978701.

It is an arithmetic number, because the mean of its divisors is an integer number (2329957398).

Almost surely, 2^6989872191 is an apocalyptic number.

6989872191 is a deficient number, since it is larger than the sum of its proper divisors (2329957401).

6989872191 is a wasteful number, since it uses less digits than its factorization.

6989872191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2329957400.

The product of its digits is 3919104, while the sum is 60.

The square root of 6989872191 is about 83605.4555097931. The cubic root of 6989872191 is about 1912.0081755010.

The spelling of 6989872191 in words is "six billion, nine hundred eighty-nine million, eight hundred seventy-two thousand, one hundred ninety-one".