6556549 has 4 divisors (see below), whose sum is σ = 6561900. Its totient is φ = 6551200.

The previous prime is 6556519. The next prime is 6556559. The reversal of 6556549 is 9456556.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 216225 + 6340324 = 465^2 + 2518^2 .

It is a cyclic number.

It is not a de Polignac number, because 6556549 - 2⁷ = 6556421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6556519) 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, 177 + ... + 3625.

It is an arithmetic number, because the mean of its divisors is an integer number (1640475).

Almost surely, 2^6556549 is an apocalyptic number.

It is an amenable number.

6556549 is a deficient number, since it is larger than the sum of its proper divisors (5351).

6556549 is a wasteful number, since it uses less digits than its factorization.

6556549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5350.

The product of its digits is 162000, while the sum is 40.

The square root of 6556549 is about 2560.5759117823. The cubic root of 6556549 is about 187.1652004645.

The spelling of 6556549 in words is "six million, five hundred fifty-six thousand, five hundred forty-nine".