6549391 has 2 divisors, whose sum is σ = 6549392. Its totient is φ = 6549390.

The previous prime is 6549383. The next prime is 6549467. The reversal of 6549391 is 1939456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6549391 - 2³ = 6549383 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6549391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6549311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3274695 + 3274696.

It is an arithmetic number, because the mean of its divisors is an integer number (3274696).

Almost surely, 2^6549391 is an apocalyptic number.

6549391 is a deficient number, since it is larger than the sum of its proper divisors (1).

6549391 is an equidigital number, since it uses as much as digits as its factorization.

6549391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 6549391 is about 2559.1777976530. The cubic root of 6549391 is about 187.0970641964.

It can be divided in two parts, 654939 and 1, that added together give a triangular number (654940 = T₁₁₄₄).

The spelling of 6549391 in words is "six million, five hundred forty-nine thousand, three hundred ninety-one".