6549989 has 4 divisors (see below), whose sum is σ = 6560160. Its totient is φ = 6539820.

The previous prime is 6549979. The next prime is 6550001. The reversal of 6549989 is 9899456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6549989 - 2⁴ = 6549973 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 (6549979) 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, 4049 + ... + 5430.

It is an arithmetic number, because the mean of its divisors is an integer number (1640040).

Almost surely, 2^6549989 is an apocalyptic number.

It is an amenable number.

6549989 is a deficient number, since it is larger than the sum of its proper divisors (10171).

6549989 is an equidigital number, since it uses as much as digits as its factorization.

6549989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10170.

The product of its digits is 699840, while the sum is 50.

The square root of 6549989 is about 2559.2946293852. The cubic root of 6549989 is about 187.1027583970.

The spelling of 6549989 in words is "six million, five hundred forty-nine thousand, nine hundred eighty-nine".