6947991 has 16 divisors (see below), whose sum is σ = 10341600. Its totient is φ = 4610304.

The previous prime is 6947959. The next prime is 6948041. The reversal of 6947991 is 1997496.

6947991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6947991 - 2⁵ = 6947959 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6947911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7015 + ... + 7943.

It is an arithmetic number, because the mean of its divisors is an integer number (646350).

Almost surely, 2^6947991 is an apocalyptic number.

6947991 is a deficient number, since it is larger than the sum of its proper divisors (3393609).

6947991 is a wasteful number, since it uses less digits than its factorization.

6947991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215 (or 1209 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 6947991 is about 2635.9042091852. The cubic root of 6947991 is about 190.8181799061.

The spelling of 6947991 in words is "six million, nine hundred forty-seven thousand, nine hundred ninety-one".