326591 has 4 divisors (see below), whose sum is σ = 343800. Its totient is φ = 309384.

The previous prime is 326581. The next prime is 326593. The reversal of 326591 is 195623.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195623 = 53 ⋅3691.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-326591 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 326591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8576 + ... + 8613.

It is an arithmetic number, because the mean of its divisors is an integer number (85950).

326591 is a Friedman number, since it can be written as 6^(9-3)*(5+2)-1, using all its digits and the basic arithmetic operations.

2³²⁶⁵⁹¹ is an apocalyptic number.

326591 is a deficient number, since it is larger than the sum of its proper divisors (17209).

326591 is a wasteful number, since it uses less digits than its factorization.

326591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17208.

The product of its digits is 1620, while the sum is 26.

The square root of 326591 is about 571.4814082715. The cubic root of 326591 is about 68.8654522927.

The spelling of 326591 in words is "three hundred twenty-six thousand, five hundred ninety-one".