6487221 has 16 divisors (see below), whose sum is σ = 9376640. Its totient is φ = 3965760.

The previous prime is 6487181. The next prime is 6487223. The reversal of 6487221 is 1227846.

It is not a de Polignac number, because 6487221 - 2⁶ = 6487157 is a prime.

It is a Curzon number.

6487221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6487223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6600 + ... + 7518.

It is an arithmetic number, because the mean of its divisors is an integer number (586040).

Almost surely, 2^6487221 is an apocalyptic number.

It is an amenable number.

6487221 is a deficient number, since it is larger than the sum of its proper divisors (2889419).

6487221 is a wasteful number, since it uses less digits than its factorization.

6487221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116.

The product of its digits is 5376, while the sum is 30.

The square root of 6487221 is about 2547.0023557115. The cubic root of 6487221 is about 186.5031756558.

The spelling of 6487221 in words is "six million, four hundred eighty-seven thousand, two hundred twenty-one".