6517989 has 14 divisors (see below), whose sum is σ = 9773606. Its totient is φ = 4344840.

The previous prime is 6517981. The next prime is 6517997. The reversal of 6517989 is 9897156.

It is an interprime number because it is at equal distance from previous prime (6517981) and next prime (6517997).

It can be written as a sum of positive squares in only one way, i.e., 5904900 + 613089 = 2430^2 + 783^2 .

It is not a de Polignac number, because 6517989 - 2³ = 6517981 is a prime.

It is a Duffinian number.

6517989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6517981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 3742 + ... + 5199.

Almost surely, 2^6517989 is an apocalyptic number.

It is an amenable number.

6517989 is a deficient number, since it is larger than the sum of its proper divisors (3255617).

6517989 is an frugal number, since it uses more digits than its factorization.

6517989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8959 (or 8944 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 6517989 is about 2553.0352524006. The cubic root of 6517989 is about 186.7975637304.

The spelling of 6517989 in words is "six million, five hundred seventeen thousand, nine hundred eighty-nine".