6491587 has 4 divisors (see below), whose sum is σ = 6496696. Its totient is φ = 6486480.

The previous prime is 6491561. The next prime is 6491623. The reversal of 6491587 is 7851946.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7851946 = 2 ⋅3925973.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6491587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6491557) 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, 1012 + ... + 3742.

It is an arithmetic number, because the mean of its divisors is an integer number (1624174).

Almost surely, 2^6491587 is an apocalyptic number.

6491587 is a deficient number, since it is larger than the sum of its proper divisors (5109).

6491587 is a wasteful number, since it uses less digits than its factorization.

6491587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5108.

The product of its digits is 60480, while the sum is 40.

The square root of 6491587 is about 2547.8592975280. The cubic root of 6491587 is about 186.5450061129.

The spelling of 6491587 in words is "six million, four hundred ninety-one thousand, five hundred eighty-seven".