6561463 has 4 divisors (see below), whose sum is σ = 6846768. Its totient is φ = 6276160.

The previous prime is 6561461. The next prime is 6561481. The reversal of 6561463 is 3641656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6561463 - 2¹ = 6561461 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142618 + ... + 142663.

It is an arithmetic number, because the mean of its divisors is an integer number (1711692).

Almost surely, 2^6561463 is an apocalyptic number.

6561463 is a deficient number, since it is larger than the sum of its proper divisors (285305).

6561463 is a wasteful number, since it uses less digits than its factorization.

6561463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285304.

The product of its digits is 12960, while the sum is 31.

The square root of 6561463 is about 2561.5352818183. The cubic root of 6561463 is about 187.2119476236.

The spelling of 6561463 in words is "six million, five hundred sixty-one thousand, four hundred sixty-three".