6551391 has 32 divisors (see below), whose sum is σ = 11059200. Its totient is φ = 3350880.

The previous prime is 6551387. The next prime is 6551393. The reversal of 6551391 is 1931556.

It is not a de Polignac number, because 6551391 - 2² = 6551387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6551393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18070 + ... + 18428.

It is an arithmetic number, because the mean of its divisors is an integer number (345600).

Almost surely, 2^6551391 is an apocalyptic number.

6551391 is a deficient number, since it is larger than the sum of its proper divisors (4507809).

6551391 is a wasteful number, since it uses less digits than its factorization.

6551391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459.

The product of its digits is 4050, while the sum is 30.

The square root of 6551391 is about 2559.5685183249. The cubic root of 6551391 is about 187.1161069870.

The spelling of 6551391 in words is "six million, five hundred fifty-one thousand, three hundred ninety-one".