6613749 has 12 divisors (see below), whose sum is σ = 9597900. Its totient is φ = 4388544.

The previous prime is 6613631. The next prime is 6613753. The reversal of 6613749 is 9473166.

It can be written as a sum of positive squares in 2 ways, for example, as 5130225 + 1483524 = 2265^2 + 1218^2 .

It is not a de Polignac number, because 6613749 - 2⁹ = 6613237 is a prime.

It is a Curzon number.

6613749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6603749) 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, 457 + ... + 3665.

It is an arithmetic number, because the mean of its divisors is an integer number (799825).

Almost surely, 2^6613749 is an apocalyptic number.

It is an amenable number.

6613749 is a deficient number, since it is larger than the sum of its proper divisors (2984151).

6613749 is a wasteful number, since it uses less digits than its factorization.

6613749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444 (or 3441 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 6613749 is about 2571.7210190843. The cubic root of 6613749 is about 187.7079080441.

The spelling of 6613749 in words is "six million, six hundred thirteen thousand, seven hundred forty-nine".