6581409 has 4 divisors (see below), whose sum is σ = 8775216. Its totient is φ = 4387604.

The previous prime is 6581401. The next prime is 6581413. The reversal of 6581409 is 9041856.

6581409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6581409 - 2³ = 6581401 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 6581409.

It is not an unprimeable number, because it can be changed into a prime (6581401) 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, 1096899 + ... + 1096904.

It is an arithmetic number, because the mean of its divisors is an integer number (2193804).

Almost surely, 2^6581409 is an apocalyptic number.

It is an amenable number.

6581409 is a deficient number, since it is larger than the sum of its proper divisors (2193807).

6581409 is a wasteful number, since it uses less digits than its factorization.

6581409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193806.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 6581409 is about 2565.4256956692. The cubic root of 6581409 is about 187.4014557728.

The spelling of 6581409 in words is "six million, five hundred eighty-one thousand, four hundred nine".