6561215 has 8 divisors (see below), whose sum is σ = 7927200. Its totient is φ = 5213152.

The previous prime is 6561209. The next prime is 6561223. The reversal of 6561215 is 5121656.

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 6561215 - 2⁴ = 6561199 is a prime.

It is a plaindrome in base 12.

It is a zygodrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3659 + ... + 5148.

It is an arithmetic number, because the mean of its divisors is an integer number (990900).

Almost surely, 2^6561215 is an apocalyptic number.

6561215 is a deficient number, since it is larger than the sum of its proper divisors (1365985).

6561215 is a wasteful number, since it uses less digits than its factorization.

6561215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8961.

The product of its digits is 1800, while the sum is 26.

The square root of 6561215 is about 2561.4868728924. The cubic root of 6561215 is about 187.2095889450.

It can be divided in two parts, 6561 and 215, that added together give a palindrome (6776).

The spelling of 6561215 in words is "six million, five hundred sixty-one thousand, two hundred fifteen".