6561535 has 8 divisors (see below), whose sum is σ = 7888320. Its totient is φ = 5239584.

The previous prime is 6561521. The next prime is 6561539. The reversal of 6561535 is 5351656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6561535 - 2¹³ = 6553343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6561497 and 6561506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3354 + ... + 4936.

It is an arithmetic number, because the mean of its divisors is an integer number (986040).

Almost surely, 2^6561535 is an apocalyptic number.

6561535 is a deficient number, since it is larger than the sum of its proper divisors (1326785).

6561535 is a wasteful number, since it uses less digits than its factorization.

6561535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417.

The product of its digits is 13500, while the sum is 31.

The square root of 6561535 is about 2561.5493358513. The cubic root of 6561535 is about 187.2126323902.

The spelling of 6561535 in words is "six million, five hundred sixty-one thousand, five hundred thirty-five".