6691479 has 4 divisors (see below), whose sum is σ = 8921976. Its totient is φ = 4460984.

The previous prime is 6691471. The next prime is 6691481. The reversal of 6691479 is 9741966.

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 6691479 - 2³ = 6691471 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 6691479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691471) 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, 1115244 + ... + 1115249.

It is an arithmetic number, because the mean of its divisors is an integer number (2230494).

Almost surely, 2^6691479 is an apocalyptic number.

6691479 is a deficient number, since it is larger than the sum of its proper divisors (2230497).

6691479 is a wasteful number, since it uses less digits than its factorization.

6691479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230496.

The product of its digits is 81648, while the sum is 42.

The square root of 6691479 is about 2586.7893226933. The cubic root of 6691479 is about 188.4404096947.

The spelling of 6691479 in words is "six million, six hundred ninety-one thousand, four hundred seventy-nine".