6506551 has 4 divisors (see below), whose sum is σ = 6548152. Its totient is φ = 6464952.

The previous prime is 6506491. The next prime is 6506557. The reversal of 6506551 is 1556056.

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 6506551 - 2⁹ = 6506039 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 (6506557) 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 3 ways as a sum of consecutive naturals, for example, 20565 + ... + 20878.

It is an arithmetic number, because the mean of its divisors is an integer number (1637038).

Almost surely, 2^6506551 is an apocalyptic number.

6506551 is a deficient number, since it is larger than the sum of its proper divisors (41601).

6506551 is a wasteful number, since it uses less digits than its factorization.

6506551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41600.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 6506551 is about 2550.7941900514. The cubic root of 6506551 is about 186.6882334067.

The spelling of 6506551 in words is "six million, five hundred six thousand, five hundred fifty-one".