6887581 has 4 divisors (see below), whose sum is σ = 6928992. Its totient is φ = 6846172.

The previous prime is 6887527. The next prime is 6887599. The reversal of 6887581 is 1857886.

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 6887581 - 2⁷ = 6887453 is a prime.

It is a super-2 number, since 2×6887581² = 94877544063122, 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 (6887501) 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, 20455 + ... + 20788.

It is an arithmetic number, because the mean of its divisors is an integer number (1732248).

Almost surely, 2^6887581 is an apocalyptic number.

It is an amenable number.

6887581 is a deficient number, since it is larger than the sum of its proper divisors (41411).

6887581 is a wasteful number, since it uses less digits than its factorization.

6887581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41410.

The product of its digits is 107520, while the sum is 43.

The square root of 6887581 is about 2624.4201264279. The cubic root of 6887581 is about 190.2635401040.

The spelling of 6887581 in words is "six million, eight hundred eighty-seven thousand, five hundred eighty-one".