6557491 has 8 divisors (see below), whose sum is σ = 6730640. Its totient is φ = 6386688.

The previous prime is 6557479. The next prime is 6557513. The reversal of 6557491 is 1947556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6557491 - 2⁵ = 6557459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6557491.

It is not an unprimeable number, because it can be changed into a prime (6557401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5995 + ... + 7003.

It is an arithmetic number, because the mean of its divisors is an integer number (841330).

Almost surely, 2^6557491 is an apocalyptic number.

6557491 is a deficient number, since it is larger than the sum of its proper divisors (173149).

6557491 is a wasteful number, since it uses less digits than its factorization.

6557491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173.

The product of its digits is 37800, while the sum is 37.

The square root of 6557491 is about 2560.7598481701. The cubic root of 6557491 is about 187.1741635728.

The spelling of 6557491 in words is "six million, five hundred fifty-seven thousand, four hundred ninety-one".