6561522 has 48 divisors (see below), whose sum is σ = 16024320. Its totient is φ = 1922400.

The previous prime is 6561521. The next prime is 6561539. The reversal of 6561522 is 2251656.

6561522 is a `hidden beast` number, since 656 + 1 + 5 + 2 + 2 = 666.

6561522 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (6561521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5604 + ... + 6672.

It is an arithmetic number, because the mean of its divisors is an integer number (333840).

Almost surely, 2^6561522 is an apocalyptic number.

6561522 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6561522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8012160).

6561522 is an abundant number, since it is smaller than the sum of its proper divisors (9462798).

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

6561522 is a wasteful number, since it uses less digits than its factorization.

6561522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119 (or 1116 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 6561522 is about 2561.5467983232. The cubic root of 6561522 is about 187.2125087521.

The spelling of 6561522 in words is "six million, five hundred sixty-one thousand, five hundred twenty-two".