6866591 has 4 divisors (see below), whose sum is σ = 7103400. Its totient is φ = 6629784.

The previous prime is 6866551. The next prime is 6866609. The reversal of 6866591 is 1956686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1956686 = 2 ⋅978343.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6866591 is a prime.

It is a super-2 number, since 2×6866591² = 94300143922562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6866551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118361 + ... + 118418.

It is an arithmetic number, because the mean of its divisors is an integer number (1775850).

Almost surely, 2^6866591 is an apocalyptic number.

6866591 is a deficient number, since it is larger than the sum of its proper divisors (236809).

6866591 is a wasteful number, since it uses less digits than its factorization.

6866591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236808.

The product of its digits is 77760, while the sum is 41.

The square root of 6866591 is about 2620.4180964113. The cubic root of 6866591 is about 190.0700664944.

The spelling of 6866591 in words is "six million, eight hundred sixty-six thousand, five hundred ninety-one".