329561 has 4 divisors (see below), whose sum is σ = 340224. Its totient is φ = 318900.

The previous prime is 329557. The next prime is 329587. The reversal of 329561 is 165923.

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: 165923 = 277 ⋅599.

It is a cyclic number.

It is not a de Polignac number, because 329561 - 2² = 329557 is a prime.

It is a super-2 number, since 2×329561² = 217220905442, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 329561.

It is not an unprimeable number, because it can be changed into a prime (329551) 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, 5285 + ... + 5346.

It is an arithmetic number, because the mean of its divisors is an integer number (85056).

2³²⁹⁵⁶¹ is an apocalyptic number.

329561 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

329561 is a deficient number, since it is larger than the sum of its proper divisors (10663).

329561 is a wasteful number, since it uses less digits than its factorization.

329561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10662.

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

The square root of 329561 is about 574.0740370370. The cubic root of 329561 is about 69.0735755119.

The spelling of 329561 in words is "three hundred twenty-nine thousand, five hundred sixty-one".