6609749 has 4 divisors (see below), whose sum is σ = 6617100. Its totient is φ = 6602400.

The previous prime is 6609737. The next prime is 6609761. The reversal of 6609749 is 9479066.

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 is an interprime number because it is at equal distance from previous prime (6609737) and next prime (6609761).

It can be written as a sum of positive squares in 2 ways, for example, as 5152900 + 1456849 = 2270^2 + 1207^2 .

It is a cyclic number.

It is not a de Polignac number, because 6609749 - 2¹² = 6605653 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 (6609769) 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 3 ways as a sum of consecutive naturals, for example, 2102 + ... + 4199.

It is an arithmetic number, because the mean of its divisors is an integer number (1654275).

Almost surely, 2^6609749 is an apocalyptic number.

It is an amenable number.

6609749 is a deficient number, since it is larger than the sum of its proper divisors (7351).

6609749 is a wasteful number, since it uses less digits than its factorization.

6609749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7350.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 6609749 is about 2570.9432121305. The cubic root of 6609749 is about 187.6700584548.

The spelling of 6609749 in words is "six million, six hundred nine thousand, seven hundred forty-nine".