6398591 has 4 divisors (see below), whose sum is σ = 6488784. Its totient is φ = 6308400.

The previous prime is 6398569. The next prime is 6398593. The reversal of 6398591 is 1958936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6398591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6398593) 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 in 3 ways as a sum of consecutive naturals, for example, 44990 + ... + 45131.

It is an arithmetic number, because the mean of its divisors is an integer number (1622196).

Almost surely, 2^6398591 is an apocalyptic number.

6398591 is a deficient number, since it is larger than the sum of its proper divisors (90193).

6398591 is an equidigital number, since it uses as much as digits as its factorization.

6398591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90192.

The product of its digits is 58320, while the sum is 41.

The square root of 6398591 is about 2529.5436347294. The cubic root of 6398591 is about 185.6499273473.

It can be divided in two parts, 639 and 8591, that multiplied together give a square (5489649 = 2343²).

The spelling of 6398591 in words is "six million, three hundred ninety-eight thousand, five hundred ninety-one".