329042561 has 4 divisors (see below), whose sum is σ = 333953712. Its totient is φ = 324131412.

The previous prime is 329042557. The next prime is 329042611. The reversal of 329042561 is 165240923.

It is a happy number.

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: 165240923 = 733 ⋅225431.

It is a cyclic number.

It is not a de Polignac number, because 329042561 - 2² = 329042557 is a prime.

It is a super-3 number, since 3×329042561³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (329042501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2455475 + ... + 2455608.

It is an arithmetic number, because the mean of its divisors is an integer number (83488428).

Almost surely, 2^329042561 is an apocalyptic number.

It is an amenable number.

329042561 is a deficient number, since it is larger than the sum of its proper divisors (4911151).

329042561 is an equidigital number, since it uses as much as digits as its factorization.

329042561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4911150.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 329042561 is about 18139.5303412189. The cubic root of 329042561 is about 690.3733616133.

The spelling of 329042561 in words is "three hundred twenty-nine million, forty-two thousand, five hundred sixty-one".