6505551 has 12 divisors (see below), whose sum is σ = 10119928. Its totient is φ = 4003344.

The previous prime is 6505549. The next prime is 6505559. The reversal of 6505551 is 1555056.

6505551 is a `hidden beast` number, since 650 + 5 + 5 + 5 + 1 = 666.

It is not a de Polignac number, because 6505551 - 2¹ = 6505549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6505559) 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 11 ways as a sum of consecutive naturals, for example, 27685 + ... + 27918.

Almost surely, 2^6505551 is an apocalyptic number.

6505551 is a deficient number, since it is larger than the sum of its proper divisors (3614377).

6505551 is a wasteful number, since it uses less digits than its factorization.

6505551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55622 (or 55619 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 6505551 is about 2550.5981651370. The cubic root of 6505551 is about 186.6786688003.

It can be divided in two parts, 6505 and 551, that added together give a square (7056 = 84²).

The spelling of 6505551 in words is "six million, five hundred five thousand, five hundred fifty-one".