6561836 has 12 divisors (see below), whose sum is σ = 11574528. Its totient is φ = 3254832.

The previous prime is 6561833. The next prime is 6561857. The reversal of 6561836 is 6381656.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 6561796 and 6561805.

It is not an unprimeable number, because it can be changed into a prime (6561833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5951 + ... + 6966.

It is an arithmetic number, because the mean of its divisors is an integer number (964544).

Almost surely, 2^6561836 is an apocalyptic number.

It is an amenable number.

6561836 is a deficient number, since it is larger than the sum of its proper divisors (5012692).

6561836 is a wasteful number, since it uses less digits than its factorization.

6561836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13048 (or 13046 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 6561836 is about 2561.6080886818. The cubic root of 6561836 is about 187.2154950405.

The spelling of 6561836 in words is "six million, five hundred sixty-one thousand, eight hundred thirty-six".