6549921 has 12 divisors (see below), whose sum is σ = 10812672. Its totient is φ = 3742776.

The previous prime is 6549901. The next prime is 6549923. The reversal of 6549921 is 1299456.

6549921 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6549921 - 2⁶ = 6549857 is a prime.

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

6549921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6549923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51921 + ... + 52046.

It is an arithmetic number, because the mean of its divisors is an integer number (901056).

Almost surely, 2^6549921 is an apocalyptic number.

It is an amenable number.

6549921 is a deficient number, since it is larger than the sum of its proper divisors (4262751).

6549921 is a wasteful number, since it uses less digits than its factorization.

6549921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103980 (or 103977 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 6549921 is about 2559.2813444403. The cubic root of 6549921 is about 187.1021109134.

The spelling of 6549921 in words is "six million, five hundred forty-nine thousand, nine hundred twenty-one".