6561954 has 48 divisors (see below), whose sum is σ = 17110080. Its totient is φ = 1775520.

The previous prime is 6561943. The next prime is 6561991. The reversal of 6561954 is 4591656.

6561954 is a `hidden beast` number, since 6 + 561 + 95 + 4 = 666.

It is a super-3 number, since 3×6561954³ (a number of 21 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1024 + ... + 3764.

It is an arithmetic number, because the mean of its divisors is an integer number (356460).

Almost surely, 2^6561954 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6561954, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8555040).

6561954 is an abundant number, since it is smaller than the sum of its proper divisors (10548126).

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

6561954 is a wasteful number, since it uses less digits than its factorization.

6561954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775 (or 2772 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 6561954 is about 2561.6311209852. The cubic root of 6561954 is about 187.2166172516.

The spelling of 6561954 in words is "six million, five hundred sixty-one thousand, nine hundred fifty-four".