6659749 has 2 divisors, whose sum is σ = 6659750. Its totient is φ = 6659748.

The previous prime is 6659713. The next prime is 6659773. The reversal of 6659749 is 9479566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4536900 + 2122849 = 2130^2 + 1457^2 .

It is a cyclic number.

It is not a de Polignac number, because 6659749 - 2¹⁵ = 6626981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6659699 and 6659708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6659249) 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 as a sum of consecutive naturals, namely, 3329874 + 3329875.

It is an arithmetic number, because the mean of its divisors is an integer number (3329875).

Almost surely, 2^6659749 is an apocalyptic number.

It is an amenable number.

6659749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6659749 is an equidigital number, since it uses as much as digits as its factorization.

6659749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 6659749 is about 2580.6489493924. The cubic root of 6659749 is about 188.1420855113.

The spelling of 6659749 in words is "six million, six hundred fifty-nine thousand, seven hundred forty-nine".