6442591 has 2 divisors, whose sum is σ = 6442592. Its totient is φ = 6442590.

The previous prime is 6442573. The next prime is 6442613. The reversal of 6442591 is 1952446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6442591 - 2⁵ = 6442559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6442531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3221295 + 3221296.

It is an arithmetic number, because the mean of its divisors is an integer number (3221296).

Almost surely, 2^6442591 is an apocalyptic number.

6442591 is a deficient number, since it is larger than the sum of its proper divisors (1).

6442591 is an equidigital number, since it uses as much as digits as its factorization.

6442591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 6442591 is about 2538.2259552688. The cubic root of 6442591 is about 186.0744970786.

It can be divided in two parts, 64425 and 91, that added together give a square (64516 = 254²).

The spelling of 6442591 in words is "six million, four hundred forty-two thousand, five hundred ninety-one".