6561224 has 16 divisors (see below), whose sum is σ = 12329820. Its totient is φ = 3273280.

The previous prime is 6561223. The next prime is 6561259. The reversal of 6561224 is 4221656.

It can be written as a sum of positive squares in 2 ways, for example, as 6340324 + 220900 = 2518^2 + 470^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6561193 and 6561202.

It is not an unprimeable number, because it can be changed into a prime (6561223) 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, 5654 + ... + 6714.

Almost surely, 2^6561224 is an apocalyptic number.

It is an amenable number.

6561224 is a deficient number, since it is larger than the sum of its proper divisors (5768596).

6561224 is a wasteful number, since it uses less digits than its factorization.

6561224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840 (or 1836 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 6561224 is about 2561.4886296839. The cubic root of 6561224 is about 187.2096745432.

The spelling of 6561224 in words is "six million, five hundred sixty-one thousand, two hundred twenty-four".