6551551 has 4 divisors (see below), whose sum is σ = 6559600. Its totient is φ = 6543504.

The previous prime is 6551533. The next prime is 6551563. The reversal of 6551551 is 1551556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6551551 - 2⁷ = 6551423 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 (6551581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2646 + ... + 4483.

It is an arithmetic number, because the mean of its divisors is an integer number (1639900).

Almost surely, 2^6551551 is an apocalyptic number.

6551551 is a deficient number, since it is larger than the sum of its proper divisors (8049).

6551551 is an equidigital number, since it uses as much as digits as its factorization.

6551551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8048.

The product of its digits is 3750, while the sum is 28.

The square root of 6551551 is about 2559.5997734021. The cubic root of 6551551 is about 187.1176302428.

The spelling of 6551551 in words is "six million, five hundred fifty-one thousand, five hundred fifty-one".