6481687 has 4 divisors (see below), whose sum is σ = 6544720. Its totient is φ = 6418656.

The previous prime is 6481669. The next prime is 6481693. The reversal of 6481687 is 7861846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7861846 = 2 ⋅3930923.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6481687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6481627) 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 3 ways as a sum of consecutive naturals, for example, 31362 + ... + 31567.

It is an arithmetic number, because the mean of its divisors is an integer number (1636180).

Almost surely, 2^6481687 is an apocalyptic number.

6481687 is a deficient number, since it is larger than the sum of its proper divisors (63033).

6481687 is a wasteful number, since it uses less digits than its factorization.

6481687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63032.

The product of its digits is 64512, while the sum is 40.

The square root of 6481687 is about 2545.9157488024. The cubic root of 6481687 is about 186.4501276610.

The spelling of 6481687 in words is "six million, four hundred eighty-one thousand, six hundred eighty-seven".