6406551 has 6 divisors (see below), whose sum is σ = 9253920. Its totient is φ = 4271028.

The previous prime is 6406549. The next prime is 6406571. The reversal of 6406551 is 1556046.

It is a happy number.

6406551 is a `hidden beast` number, since 6 + 4 + 0 + 655 + 1 = 666.

6406551 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 6406551 - 2¹ = 6406549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6406571) 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 5 ways as a sum of consecutive naturals, for example, 355911 + ... + 355928.

It is an arithmetic number, because the mean of its divisors is an integer number (1542320).

Almost surely, 2^6406551 is an apocalyptic number.

6406551 is a deficient number, since it is larger than the sum of its proper divisors (2847369).

6406551 is a wasteful number, since it uses less digits than its factorization.

6406551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711845 (or 711842 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 6406551 is about 2531.1165520379. The cubic root of 6406551 is about 185.7268797602.

The spelling of 6406551 in words is "six million, four hundred six thousand, five hundred fifty-one".