6891081 has 4 divisors (see below), whose sum is σ = 9188112. Its totient is φ = 4594052.

The previous prime is 6891077. The next prime is 6891107. The reversal of 6891081 is 1801986.

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.

It is a cyclic number.

It is not a de Polignac number, because 6891081 - 2² = 6891077 is a prime.

It is a super-2 number, since 2×6891081² = 94973994697122, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6891011) 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, 1148511 + ... + 1148516.

It is an arithmetic number, because the mean of its divisors is an integer number (2297028).

Almost surely, 2^6891081 is an apocalyptic number.

It is an amenable number.

6891081 is a deficient number, since it is larger than the sum of its proper divisors (2297031).

6891081 is a wasteful number, since it uses less digits than its factorization.

6891081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297030.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 6891081 is about 2625.0868557059. The cubic root of 6891081 is about 190.2957628164.

It can be divided in two parts, 689 and 1081, that added together give a triangular number (1770 = T₅₉).

The spelling of 6891081 in words is "six million, eight hundred ninety-one thousand, eighty-one".