6581216 has 12 divisors (see below), whose sum is σ = 12956832. Its totient is φ = 3290592.

The previous prime is 6581191. The next prime is 6581221. The reversal of 6581216 is 6121856.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 102800 + ... + 102863.

It is an arithmetic number, because the mean of its divisors is an integer number (1079736).

Almost surely, 2^6581216 is an apocalyptic number.

It is an amenable number.

6581216 is a deficient number, since it is larger than the sum of its proper divisors (6375616).

6581216 is a wasteful number, since it uses less digits than its factorization.

6581216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205673 (or 205665 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 6581216 is about 2565.3880798039. The cubic root of 6581216 is about 187.3996239040.

The spelling of 6581216 in words is "six million, five hundred eighty-one thousand, two hundred sixteen".