6581444 has 12 divisors (see below), whose sum is σ = 11541264. Its totient is φ = 3283944.

The previous prime is 6581441. The next prime is 6581447. The reversal of 6581444 is 4441856.

It is an interprime number because it is at equal distance from previous prime (6581441) and next prime (6581447).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6581444.

It is not an unprimeable number, because it can be changed into a prime (6581441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947 + ... + 3749.

It is an arithmetic number, because the mean of its divisors is an integer number (961772).

Almost surely, 2^6581444 is an apocalyptic number.

It is an amenable number.

6581444 is a deficient number, since it is larger than the sum of its proper divisors (4959820).

6581444 is a wasteful number, since it uses less digits than its factorization.

6581444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394 (or 3392 counting only the distinct ones).

The product of its digits is 15360, while the sum is 32.

The square root of 6581444 is about 2565.4325171401. The cubic root of 6581444 is about 187.4017879732.

The spelling of 6581444 in words is "six million, five hundred eighty-one thousand, four hundred forty-four".