326981 has 4 divisors (see below), whose sum is σ = 331200.
Its totient is φ = 322764.
The previous prime is 326951. The next prime is 326983. The reversal of 326981 is 189623.
It is an alternating factorial (326981 = 9! - 8! + 7! - 6! + 5! - 4! + 3! - 2! + 1!).
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.
It is a cyclic number.
It is not a de Polignac number, because 326981 - 210 = 325957 is a prime.
It is a super-2 number, since 2×3269812 = 213833148722, which contains 22 as substring.
It is a Duffinian number.
It is a Curzon number.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 326981.
It is not an unprimeable number, because it can be changed into a prime (326983) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1991 + ... + 2148.
It is an arithmetic number, because the mean of its divisors is an integer number (82800).
2326981 is an apocalyptic number.
It is an amenable number.
326981 is a deficient number, since it is larger than the sum of its proper divisors (4219).
326981 is an equidigital number, since it uses as much as digits as its factorization.
326981 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4218.
The product of its digits is 2592, while the sum is 29.
The square root of 326981 is about 571.8225249149.
The cubic root of 326981 is about 68.8928533773.
The spelling of 326981 in words is "three hundred twenty-six thousand, nine hundred eighty-one".