6557749 has 4 divisors (see below), whose sum is σ = 7153920. Its totient is φ = 5961580.

The previous prime is 6557731. The next prime is 6557753. The reversal of 6557749 is 9477556.

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 6557749 - 2¹⁵ = 6524981 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 (6057749) 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, 298069 + ... + 298090.

It is an arithmetic number, because the mean of its divisors is an integer number (1788480).

Almost surely, 2^6557749 is an apocalyptic number.

It is an amenable number.

6557749 is a deficient number, since it is larger than the sum of its proper divisors (596171).

6557749 is a wasteful number, since it uses less digits than its factorization.

6557749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596170.

The product of its digits is 264600, while the sum is 43.

The square root of 6557749 is about 2560.8102233473. The cubic root of 6557749 is about 187.1766182871.

It can be divided in two parts, 6 and 557749, that added together give a palindrome (557755).

The spelling of 6557749 in words is "six million, five hundred fifty-seven thousand, seven hundred forty-nine".