6891271 has 4 divisors (see below), whose sum is σ = 6903232. Its totient is φ = 6879312.

The previous prime is 6891251. The next prime is 6891277. The reversal of 6891271 is 1721986.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6891271 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 (6891277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5070 + ... + 6283.

It is an arithmetic number, because the mean of its divisors is an integer number (1725808).

Almost surely, 2^6891271 is an apocalyptic number.

6891271 is a deficient number, since it is larger than the sum of its proper divisors (11961).

6891271 is a wasteful number, since it uses less digits than its factorization.

6891271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11960.

The product of its digits is 6048, while the sum is 34.

The square root of 6891271 is about 2625.1230447352. The cubic root of 6891271 is about 190.2975117371.

The spelling of 6891271 in words is "six million, eight hundred ninety-one thousand, two hundred seventy-one".