6978191 has 12 divisors (see below), whose sum is σ = 7759752. Its totient is φ = 6270000.

The previous prime is 6978173. The next prime is 6978199. The reversal of 6978191 is 1918796.

It is a happy number.

It is not a de Polignac number, because 6978191 - 2¹⁰ = 6977167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6978199) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11936 + ... + 12506.

It is an arithmetic number, because the mean of its divisors is an integer number (646646).

Almost surely, 2^6978191 is an apocalyptic number.

6978191 is a deficient number, since it is larger than the sum of its proper divisors (781561).

6978191 is a wasteful number, since it uses less digits than its factorization.

6978191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 683 counting only the distinct ones).

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

The square root of 6978191 is about 2641.6265822406. The cubic root of 6978191 is about 191.0942491458.

It can be divided in two parts, 697 and 8191, that added together give a palindrome (8888).

The spelling of 6978191 in words is "six million, nine hundred seventy-eight thousand, one hundred ninety-one".