6531987 has 16 divisors (see below), whose sum is σ = 10858752. Its totient is φ = 3393120.

The previous prime is 6531983. The next prime is 6532003. The reversal of 6531987 is 7891356.

It is not a de Polignac number, because 6531987 - 2² = 6531983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6531983) 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 15 ways as a sum of consecutive naturals, for example, 13908 + ... + 14369.

It is an arithmetic number, because the mean of its divisors is an integer number (678672).

Almost surely, 2^6531987 is an apocalyptic number.

6531987 is a deficient number, since it is larger than the sum of its proper divisors (4326765).

6531987 is a wasteful number, since it uses less digits than its factorization.

6531987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28298.

The product of its digits is 45360, while the sum is 39.

The square root of 6531987 is about 2555.7752248584. The cubic root of 6531987 is about 186.9311899501.

The spelling of 6531987 in words is "six million, five hundred thirty-one thousand, nine hundred eighty-seven".