6561912 has 64 divisors (see below), whose sum is σ = 18950400. Its totient is φ = 1854720.

The previous prime is 6561911. The next prime is 6561937. The reversal of 6561912 is 2191656.

It is a self number, because there is not a number n which added to its sum of digits gives 6561912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23212 + ... + 23492.

It is an arithmetic number, because the mean of its divisors is an integer number (296100).

Almost surely, 2^6561912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6561912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9475200).

6561912 is an abundant number, since it is smaller than the sum of its proper divisors (12388488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6561912 is a wasteful number, since it uses less digits than its factorization.

6561912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 432 counting only the distinct ones).

The product of its digits is 3240, while the sum is 30.

The square root of 6561912 is about 2561.6229230705. The cubic root of 6561912 is about 187.2162178221.

The spelling of 6561912 in words is "six million, five hundred sixty-one thousand, nine hundred twelve".