6887561 has 4 divisors (see below), whose sum is σ = 6893124. Its totient is φ = 6882000.

The previous prime is 6887527. The next prime is 6887599. The reversal of 6887561 is 1657886.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 855625 + 6031936 = 925^2 + 2456^2 .

It is a cyclic number.

It is not a de Polignac number, because 6887561 - 2¹⁴ = 6871177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6887501) 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, 11 + ... + 3711.

It is an arithmetic number, because the mean of its divisors is an integer number (1723281).

Almost surely, 2^6887561 is an apocalyptic number.

It is an amenable number.

6887561 is a deficient number, since it is larger than the sum of its proper divisors (5563).

6887561 is a wasteful number, since it uses less digits than its factorization.

6887561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5562.

The product of its digits is 80640, while the sum is 41.

The square root of 6887561 is about 2624.4163160596. The cubic root of 6887561 is about 190.2633559429.

The spelling of 6887561 in words is "six million, eight hundred eighty-seven thousand, five hundred sixty-one".