6891641 has 4 divisors (see below), whose sum is σ = 7113984. Its totient is φ = 6669300.

The previous prime is 6891637. The next prime is 6891673. The reversal of 6891641 is 1461986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1461986 = 2 ⋅730993.

It is a cyclic number.

It is not a de Polignac number, because 6891641 - 2² = 6891637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6891601) 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, 111125 + ... + 111186.

It is an arithmetic number, because the mean of its divisors is an integer number (1778496).

Almost surely, 2^6891641 is an apocalyptic number.

It is an amenable number.

6891641 is a deficient number, since it is larger than the sum of its proper divisors (222343).

6891641 is a wasteful number, since it uses less digits than its factorization.

6891641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222342.

The product of its digits is 10368, while the sum is 35.

The square root of 6891641 is about 2625.1935166764. The cubic root of 6891641 is about 190.3009174377.

The spelling of 6891641 in words is "six million, eight hundred ninety-one thousand, six hundred forty-one".