326661 has 4 divisors (see below), whose sum is σ = 435552. Its totient is φ = 217772.

The previous prime is 326659. The next prime is 326663. The reversal of 326661 is 166623.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166623 = 3 ⋅55541.

It is an interprime number because it is at equal distance from previous prime (326659) and next prime (326663).

It is a cyclic number.

It is not a de Polignac number, because 326661 - 2¹ = 326659 is a prime.

It is a D-number.

326661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326663) 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, 54441 + ... + 54446.

It is an arithmetic number, because the mean of its divisors is an integer number (108888).

2³²⁶⁶⁶¹ is an apocalyptic number.

It is an amenable number.

326661 is a deficient number, since it is larger than the sum of its proper divisors (108891).

326661 is a wasteful number, since it uses less digits than its factorization.

326661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108890.

The product of its digits is 1296, while the sum is 24.

The square root of 326661 is about 571.5426493272. The cubic root of 326661 is about 68.8703720418.

The spelling of 326661 in words is "three hundred twenty-six thousand, six hundred sixty-one".