6987191 has 4 divisors (see below), whose sum is σ = 7176072. Its totient is φ = 6798312.

The previous prime is 6987163. The next prime is 6987203. The reversal of 6987191 is 1917896.

It is a happy number.

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-6987191 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 (6987091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94385 + ... + 94458.

It is an arithmetic number, because the mean of its divisors is an integer number (1794018).

Almost surely, 2^6987191 is an apocalyptic number.

6987191 is a deficient number, since it is larger than the sum of its proper divisors (188881).

6987191 is a wasteful number, since it uses less digits than its factorization.

6987191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188880.

The product of its digits is 27216, while the sum is 41.

The square root of 6987191 is about 2643.3295292112. The cubic root of 6987191 is about 191.1763673428.

The spelling of 6987191 in words is "six million, nine hundred eighty-seven thousand, one hundred ninety-one".