6427691 has 4 divisors (see below), whose sum is σ = 6433632. Its totient is φ = 6421752.

The previous prime is 6427679. The next prime is 6427703. The reversal of 6427691 is 1967246.

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 an interprime number because it is at equal distance from previous prime (6427679) and next prime (6427703).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6427691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6427651) 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, 836 + ... + 3681.

It is an arithmetic number, because the mean of its divisors is an integer number (1608408).

Almost surely, 2^6427691 is an apocalyptic number.

6427691 is a deficient number, since it is larger than the sum of its proper divisors (5941).

6427691 is a wasteful number, since it uses less digits than its factorization.

6427691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5940.

The product of its digits is 18144, while the sum is 35.

The square root of 6427691 is about 2535.2891353848. The cubic root of 6427691 is about 185.9309394056.

The spelling of 6427691 in words is "six million, four hundred twenty-seven thousand, six hundred ninety-one".