329491 has 4 divisors (see below), whose sum is σ = 331632. Its totient is φ = 327352.

The previous prime is 329489. The next prime is 329503. The reversal of 329491 is 194923.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194923 = 421 ⋅463.

It is a cyclic number.

It is not a de Polignac number, because 329491 - 2¹ = 329489 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a zygodrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (329401) 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, 820 + ... + 1153.

It is an arithmetic number, because the mean of its divisors is an integer number (82908).

2³²⁹⁴⁹¹ is an apocalyptic number.

329491 is a deficient number, since it is larger than the sum of its proper divisors (2141).

329491 is a wasteful number, since it uses less digits than its factorization.

329491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140.

The product of its digits is 1944, while the sum is 28.

The square root of 329491 is about 574.0130660534. The cubic root of 329491 is about 69.0686846696.

It can be divided in two parts, 329 and 491, that added together give a triangular number (820 = T₄₀).

The spelling of 329491 in words is "three hundred twenty-nine thousand, four hundred ninety-one".