6561229 has 4 divisors (see below), whose sum is σ = 6594400. Its totient is φ = 6528060.

The previous prime is 6561223. The next prime is 6561259. The reversal of 6561229 is 9221656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6561229 - 2⁵ = 6561197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6561229.

It is a congruent number.

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, 16287 + ... + 16684.

It is an arithmetic number, because the mean of its divisors is an integer number (1648600).

Almost surely, 2^6561229 is an apocalyptic number.

It is an amenable number.

6561229 is a deficient number, since it is larger than the sum of its proper divisors (33171).

6561229 is a wasteful number, since it uses less digits than its factorization.

6561229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33170.

The product of its digits is 6480, while the sum is 31.

The square root of 6561229 is about 2561.4896056787. The cubic root of 6561229 is about 187.2097220978.

The spelling of 6561229 in words is "six million, five hundred sixty-one thousand, two hundred twenty-nine".