329261 has 4 divisors (see below), whose sum is σ = 333312. Its totient is φ = 325212.

The previous prime is 329257. The next prime is 329267. The reversal of 329261 is 162923.

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: 162923 = 191 ⋅853.

It is a cyclic number.

It is not a de Polignac number, because 329261 - 2² = 329257 is a prime.

It is a super-2 number, since 2×329261² = 216825612242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (329267) 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, 1901 + ... + 2066.

It is an arithmetic number, because the mean of its divisors is an integer number (83328).

2³²⁹²⁶¹ is an apocalyptic number.

It is an amenable number.

329261 is a deficient number, since it is larger than the sum of its proper divisors (4051).

329261 is an equidigital number, since it uses as much as digits as its factorization.

329261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050.

The product of its digits is 648, while the sum is 23.

The square root of 329261 is about 573.8126872072. The cubic root of 329261 is about 69.0526098803.

The spelling of 329261 in words is "three hundred twenty-nine thousand, two hundred sixty-one".