6520909 has 4 divisors (see below), whose sum is σ = 6618304. Its totient is φ = 6423516.

The previous prime is 6520903. The next prime is 6520919. The reversal of 6520909 is 9090256.

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 6520909 - 2¹⁹ = 5996621 is a prime.

It is a Duffinian number.

6520909 is a modest number, since divided by 909 gives 652 as remainder.

6520909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520903) 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, 48597 + ... + 48730.

It is an arithmetic number, because the mean of its divisors is an integer number (1654576).

Almost surely, 2^6520909 is an apocalyptic number.

It is an amenable number.

6520909 is a deficient number, since it is larger than the sum of its proper divisors (97395).

6520909 is an equidigital number, since it uses as much as digits as its factorization.

6520909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97394.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 6520909 is about 2553.6070566945. The cubic root of 6520909 is about 186.8254541045.

The spelling of 6520909 in words is "six million, five hundred twenty thousand, nine hundred nine".