6991079 has 4 divisors (see below), whose sum is σ = 6996384. Its totient is φ = 6985776.

The previous prime is 6991043. The next prime is 6991091. The reversal of 6991079 is 9701996.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6991079 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 (6991099) 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, 1019 + ... + 3875.

It is an arithmetic number, because the mean of its divisors is an integer number (1749096).

Almost surely, 2^6991079 is an apocalyptic number.

6991079 is a deficient number, since it is larger than the sum of its proper divisors (5305).

6991079 is a wasteful number, since it uses less digits than its factorization.

6991079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5304.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 6991079 is about 2644.0648630470. The cubic root of 6991079 is about 191.2118205929.

The spelling of 6991079 in words is "six million, nine hundred ninety-one thousand, seventy-nine".